| API | Description | Category | Updated |
|---|---|---|---|
| 24 Pull Requests | Annual pull request sending event | Events | 2013-04-16 |
| Aalto University | Aalto University course portal information | Education | 2013-04-18 |
| Acrostic.me Trending | Bible poetry feed service | Feeds | 2012-08-06 |
| Active RegOnline | Event Planning Service | Project Management | 2013-03-01 |
| AddThis Analytics | Content sharing analytics data service | Internet | 2010-02-05 |
| AddThis Services | AddThis Integration Service | Internet | 2011-01-04 |
| AddThis Sharing Endpoints | Content sharing service | Internet | 2010-02-05 |
| Adobe PhoneGap Build | Cloud-based app compiler | Internet | 2012-10-09 |
| AIDS.gov Service Provider Locator | HIV/AIDS testing and care information service | Government | 2012-04-05 |
| Alchemy | Semantic text and data dection and extraction | Tools | 2009-10-02 |
| AlchemyAPI Keyword and Term Extraction | Text analysis and extraction tool | Utility | 2010-01-14 |
| AlchemyAPI Language Detection | Language detection and analysis tool | Tools | 2009-12-18 |
| AlchemyAPI Text Categorization | Text analysis and categorization tool | Tools | 2009-12-18 |
| AlterGeo | Local recommendation service | Social | 2010-10-21 |
| Altmetric | Scholarly article discussion tracker | Education | 2012-11-27 |
| AngelList | Startup financing community | Social | 2011-09-15 |
| AnswerHub | Enterprise Q&A platform | Answers | 2013-05-03 |
| AOL Calendar | Online calendar service | Calendar | 2010-12-14 |
| AORecipeBook | Anarchy Online tradeskills recipe bot | Games | 2013-02-06 |
| Apertium | Translation Service | Tools | 2011-01-06 |
| APIfy | Create APIs from structured web data | Internet | 2012-06-07 |
| art.sy | Artwork information discovery service | Search | 2012-04-10 |
| Ask AMEE | Natural language query service | Search | 2012-04-30 |
| Astroboa Resource | Information Management Service | Enterprise | 2012-08-21 |
| Audioboo | Audio sharing platform | Messaging | 2011-02-15 |
| Audiosocket MaaS | Music licensing agency | Music | 2011-07-26 |
| Avatax Sales Tax | Sales tax management service | Financial | 2012-05-02 |
| Bandsintown | Music concerts and recommendations service | Music | 2009-09-27 |
| Barium Live | Business process management service | Enterprise | 2012-04-17 |
| BayWeb Cloud-EMS | Remote HVAC control service | Tools | 2013-02-04 |
| Bazaarvoice Platform | Social marketing platform | Social | 2011-09-26 |
| Behance | Creative portfolio service | Other | 2012-08-31 |
| Bentio | Microblogging Service | Blogging | 2011-02-08 |
| Best Buy BBYOpen BBYScan | eCommerce shopping services | Shopping | 2011-09-08 |
| Best Buy BBYOpen Categories | Shopping categorization service | Shopping | 2011-09-06 |
| Best Buy BBYOpen Products | eCommerce shopping services | Shopping | 2008-10-25 |
| Best Buy BBYOpen Reviews | Shopping reviews service | Shopping | 2011-09-06 |
| Biblia.com | Online bible reference service | Reference | 2010-03-29 |
| Big Huge Thesaurus | Thesaurus lookup services | Reference | 2008-08-28 |
| Billboard | Music chart service | Music | 2009-02-23 |
| Bing Maps Routes | Mapping route creation service | Mapping | 2011-08-09 |
| bipio | API pipelining service | Feeds | 2013-04-19 |
| Bit.ly | URL shortening service | Internet | 2008-07-13 |
| Bitacoras.com | Spanish social blog network | Blogging | 2010-03-24 |
| BitMyMoney | Bitcoin Payment and Holding Service | Payment | 2013-05-20 |
| Bizo BizAudience | Internet business traget service | Other | 2010-04-22 |
| Black Lotus Project Price Ticker | Magic: the Gathering card price ticker | Games | 2012-08-29 |
| BLAM Ads | Content locking advertising service | Advertising | 2012-01-23 |
| BlankSlate | Web App Building Blocks | Database | 2010-02-24 |
| Blipfoto | Photo sharing service | Photos | 2012-05-07 |
| blippr | Recommendations service | Recommendations | 2009-03-30 |
| Blobbr | Social polling service | Social | 2011-11-03 |
| Bongo | Iowa cities transit data | Transportation | 2011-10-18 |
| Boxcar | Social messaging aggregation service | Social | 2011-07-07 |
| Bramus Simple REST API Explorer | REST API endpoint exploration service | Tools | 2012-04-19 |
| Brazil CKAN | Brazil open government data | Government | 2011-12-23 |
| Brightcove | Video publishing service | Video | 2009-04-03 |
| Brighter Planet Emission Estimates | Real-time carbon footprint estimates | Other | 2010-11-03 |
| Bugrocket | Bug tracking tool | Tools | 2012-05-29 |
| Bugzilla | Bug-tracking service | Tools | 2012-05-22 |
| Burning Man | Event database | Events | 2009-08-30 |
| Buzzzy | Google Buzz Search Engine | Search | 2011-01-12 |
| Cadmus | Social media stream management service | Social | 2011-02-08 |
| Callook | US amateur radio callsign lookup | Reference | 2010-12-29 |
| Camera Plus | iPhone photo application | Photos | 2012-03-14 |
| CampBX | Bitcoin Trading Service | Financial | 2013-05-10 |
| CEERN | Conservation and Environment Resource Database | Reference | 2011-02-08 |
| CENSUS.IRE.ORG | 2010 census data access service | Government | 2012-09-11 |
| chartbeat | Website analytics service | Internet | 2009-04-06 |
| Chevereto | Image hosting service | Media Management | 2012-11-28 |
| Chicago Boundary Service | Illinois geographic boundary data | Mapping | 2012-11-13 |
| Cineworld | UK cinema information | Entertainment | 2013-05-07 |
| CIR VA Backlog | Veterans Affairs benefits data | Government | 2013-05-08 |
| CiteULike | Citation management service | Reference | 2011-11-08 |
| City of Nanaimo | Nanaimo, B.C., datasets | Government | 2011-11-15 |
| CityBikes | Bike sharing network information service | Transportation | 2011-12-23 |
| Civic Commons Marketplace | Open government data database and sharing platform | Government | 2012-01-20 |
| CKAN | Data portal platform service | Internet | 2010-10-20 |
| CKAN Czech Republic | Czech Republic open government data | Government | 2012-01-05 |
| CKAN Ireland | Ireland open government data | Government | 2011-12-23 |
| CKAN Italy | Italian open government data | Government | 2012-01-05 |
| CKAN Norway | Norway open government data | Government | 2012-01-05 |
| Click A Taxi | Taxi cab booking service | Transportation | 2013-02-27 |
| Clicky | Web site analytics | Internet | 2007-07-27 |
| Climate Counts | Corporate climate change monitoring service | Other | 2012-07-26 |
| CloudFlare Client Interface | Content delivery network | Internet | 2011-12-08 |
| CloudMade Geocoding | Forward and Reverse Geocoding Service | Mapping | 2010-11-22 |
| CloudMade NavEngine | Driving directions service | Mapping | 2010-11-22 |
| Cloudvox | Voice application platform | Telephony | 2009-10-12 |
| cnFOL | Chinese microblogging service | Blogging | 2010-12-21 |
| Codebits | Codebits Conference Information Tools | Events | 2011-02-23 |
| Coderwall Profile | User profile data service | Social | 2012-03-27 |
| COLOURlovers | Named colors and color palette services | Tools | 2008-04-20 |
| Comic Vine | Comic book reference database | Other | 2009-05-26 |
| Convore | Real-time group chat application | Chat | 2011-06-14 |
| Copy2Contact | Online contact entry and data parsing service | Internet | 2010-01-11 |
| Cruvee Social | Social media search for wine industry | Search | 2010-11-30 |
| Cruvee Wine Search | Wine industry search service | Search | 2010-11-29 |
| CS50 | Harvard campus information | Education | 2012-11-29 |
| CS50 HarvardEvents | Harvard Events Calendar | Events | 2011-09-13 |
| Dailymile | The Social Workout Platform | Sports | 2011-01-10 |
| Data Greater Manchester | Manchester, England open government data | Government | 2011-12-23 |
| Data Science Toolkit | Open Source tools for science | Reference | 2011-04-15 |
| Datadotgc.ca | Canadian open government data | Government | 2012-01-05 |
| DataGov.ru | Russian open government data | Government | 2011-12-23 |
| DataSift | Real-Time Social Data Mining | Social | 2010-12-20 |
| dataTXT by SpazioDati | Data and text extraction and linking service | Tools | 2012-05-18 |
| Daum Cafe | Online community services | Social | 2011-07-12 |
| Daum Calendar | Calendar services | Calendar | 2011-07-12 |
| Daum Context Keyword | Contextual keyword extraction service | Tools | 2011-07-12 |
| Daum Events | Movie and festival search service | Events | 2011-07-12 |
| Daum Search | Search services | Search | 2011-07-12 |
| Daum Today | Micro blogging service | Blogging | 2011-07-12 |
| deCarta MapSearch Engine | Local search services | Mapping | 2012-02-15 |
| Deezer | Music streaming service | Music | 2012-05-04 |
| Despegar | Latin America travel site | Travel | 2012-03-01 |
| deutschland | German elected officials information service | Government | 2012-03-28 |
| deviantART | Social network for artists | Social | 2011-11-04 |
| DomainsBot | Domain name suggestion service | Internet | 2012-07-18 |
| DonorsChoose | An online charity connecting you to classrooms in need | Education | 2009-04-03 |
| Dozuki | Documentation software | Project Management | 2012-10-15 |
| Dribbble | Webdesign showcase | Other | 2010-12-16 |
| Dropbox | Online storage provider | Storage | 2010-08-04 |
| Duck Duck Go | Internet search engine | Search | 2011-01-05 |
| Eaupen | Free drinking water location service for Paris | Travel | 2012-11-30 |
| Echo Nest | Music services for professionals | Music | 2008-09-20 |
| Edmunds.com Dealer | Vehicle dealer information | Database | 2011-11-02 |
| Edmunds.com Inventory | Specific automobile information via VIN | Reference | 2011-11-02 |
| Edmunds.com Vehicle | Automobile information | Reference | 2011-11-02 |
| Einztein | Search API for Einztein Social Learning Network | Social | 2011-02-02 |
| Elance | Online job marketplace | Job Search | 2010-10-01 |
| Elev.at | Text and Excel conversion to XML tool | Tools | 2010-01-27 |
| eLife | Biological sciences journal access service | Science | 2013-05-02 |
| eMusic | Music and Audiobook Search Service | Music | 2010-06-09 |
| Encyclopedia of Life | Biology Encyclopedia | Reference | 2011-02-28 |
| Enstore | Custom Enstore Client Creation | Shopping | 2011-02-02 |
| Entireweb | Web search service | Search | 2010-08-26 |
| Ergast | Motor racing data service | Sports | 2009-03-26 |
| Esri Community Analyst | Application Building Service | Mapping | 2012-07-11 |
| Etsy | Handmade product marketplace | Shopping | 2009-03-23 |
| European VAT Number Validation | European Union value added tax number validation | Tools | 2012-12-04 |
| Eventfinda | New Zealand events service | Events | 2013-05-14 |
| EventPoint | Event planning and publicizing services | Events | 2012-10-31 |
| Everytime | Music and video clip saving and sharing service | Bookmarks | 2012-11-09 |
| Evri | Recommendations and semantic search service | Recommendations | 2008-12-14 |
| Face.com | Face Recognition | Photos | 2010-05-04 |
| Facebook Graph | Facebook Social Graph API | Social | 2010-12-20 |
| FamilySearch | Genealogical search and family tree service | Other | 2011-12-19 |
| FAOdata | Worldwide food and agriculture data | Database | 2012-12-28 |
| Favatar | Favicon retrieval service | Media Search | 2012-07-02 |
| Faves.com | Social Bookmarking | Bookmarks | 2011-08-29 |
| FCC | U.S. Communications Data Service | Government | 2010-09-14 |
| FeaturePics | Stock photography provider | Photos | 2011-07-28 |
| FederalRegister.gov | Open source government data | Government | 2011-08-12 |
| File MD5 | MD5 file hash service | Utility | 2010-01-29 |
| Flickr | Photo sharing service | Photos | 2005-09-04 |
| Flickr Real-Time | Realtime photo updates from Flickr | Photos | 2011-08-19 |
| Fluidinfo | Online storage and search platform for metadata | Search | 2011-09-15 |
| Fluxiom | Online File Storage and Management | Storage | 2011-02-28 |
| follow cost | Find the follow cost of a Twitter account | Social | 2009-09-30 |
| foursquare | Social networking and city exploration | Social | 2009-09-15 |
| foursquare Merchant | foursquare merchant platform | Shopping | 2011-07-26 |
| Free Music Archive | MP3 archive | Music | 2011-11-08 |
| Freebase | Community driven open database | Database | 2007-10-13 |
| Garmin MotionBased | GPS services and mapping | Sports | 2007-06-05 |
| GEMET | Multi-language thesaurus management service | Reference | 2012-05-07 |
| Genability | Electricity price data service | Reference | 2011-04-07 |
| Geobytes Ajax Autocomplete Cities List | Autocompleting list of cities and city information | Tools | 2012-08-24 |
| Geognos World Countries | Worldwide geocoding information service | Mapping | 2010-12-29 |
| Geolenz | Reverse geocoding service | Tools | 2010-02-21 |
| GeoMaker | Geo enrichment platform | Mapping | 2011-06-30 |
| GeoNames | Geographic name and postal code lookup | Reference | 2006-01-12 |
| GeoSmart | New Zealand geospatial and mapping services | Mapping | 2007-11-18 |
| Giant Bomb | Database of game information | Games | 2009-06-12 |
| Gifts.com | Gift recommendation service | Shopping | 2011-04-07 |
| Gipuzkoa | Spanish province government data | Government | 2011-08-30 |
| GitHub | Source code repository | Tools | 2009-04-03 |
| GitHub Jobs | Computer-related job listing service | Job Search | 2013-02-04 |
| Glimt | Norway event aggregation service | Events | 2012-06-26 |
| Glitch | Online massively multiplayer game | Games | 2011-10-02 |
| Go.USA.gov | Government domain URL shortener | Government | 2012-10-22 |
| goEmerchant | Online payment service | Payment | 2013-02-15 |
| Google Compute Engine | Google based virtual machine service | Backend | 2012-07-11 |
| Google DoubleClick Ad Exchange Seller | Advertising campaign management service | Advertising | 2012-10-26 |
| Google Enterprise License Manager | License Manager | Enterprise | 2012-08-23 |
| Google Page Speed Online | Website speed scores and optimization | Internet | 2011-05-20 |
| Google Reader Subscriber Statistics | RSS feed statistics | Blogging | 2010-07-19 |
| Google Social Graph | Search service for finding social connections | Social | 2008-02-01 |
| GoSquared | Real time web analytics | Internet | 2012-08-03 |
| gPodder | Podcast retrieval service | Tools | 2011-08-19 |
| Groupcentric | User engagement service for applications | Social | 2013-03-05 |
| GW2Spidy | Guild Wars 2 marketplace | Games | 2012-11-02 |
| HAMweather Aeris | Weather data service | Weather | 2012-01-10 |
| Hathi Trust Data Distribution | Library catalog search service | Reference | 2010-03-24 |
| HathiTrust Volumes | Library catalogue information retrieval service | Education | 2011-12-09 |
| Heello | Microblogging service | Social | 2012-05-29 |
| Helsinkikanava Open Data | Helsinki city council meeting information and recordings | Government | 2012-08-30 |
| HTTP Redirect Chain Enumerator | Search Engine Optimization tool | Utility | 2010-08-13 |
| Hyves | Social networking and events service | Social | 2008-11-16 |
| Hyves Data | Dutch social networking site | Social | 2011-07-14 |
| IconFinder | Graphic icon and image search | Search | 2012-06-21 |
| IdeaScale | Online Community Data Tools | Social | 2010-12-20 |
| Idescat Advance Release Calendar | Idescat publications calendar | Calendar | 2012-06-06 |
| Idescat Catalan and Spanish Indicators | Economic indicator service | Financial | 2010-05-17 |
| Idescat Municipality in Figures | Statistical information on Catalan municipalities | Government | 2010-12-02 |
| Idescat Population Search | Population search | Search | 2010-10-11 |
| Idescat Rectifications | Rectifications registry lookup service | Reference | 2010-12-02 |
| idiomag | Musical artist information service | Music | 2008-12-16 |
| Illinois 2010 School Report Cards | Illinois public school grade reporting service | Education | 2011-10-18 |
| Influence Explorer Text | Textual analysis tool | Government | 2011-08-01 |
| InfoChimps IP Intelligence Demographics | Census data based on IP address | Reference | 2011-02-28 |
| Infochimps IP Intelligence Geolocation | Data mining tool | Internet | 2010-06-05 |
| InfoChimps Social | Twitter Metrics and Analytics | Social | 2011-02-28 |
| Infunl Web Analytics | Web analytics and tracking service | Internet | 2012-02-09 |
| InKnowledge Taxi Fare Calculator | Taxi fare estimation service | Transportation | 2012-01-05 |
| Mobile photo sharing service | Photos | 2010-12-15 | |
| Instapaper | Bookmark long web pages | Bookmarks | 2010-12-29 |
| International Aid Transparency Initiative | Aid spending index | Government | 2012-01-05 |
| Interserve Job Openings | Ministry jobs feed service | Feeds | 2012-07-24 |
| Interstate Developers | Project development roadmaps tool | Project Management | 2011-07-14 |
| ioBridge | Retrieve module feed URLs | Tools | 2010-11-02 |
| IODA Open | Online Music Distribution Database | Music | 2011-03-24 |
| IP-API.com Geolocation | IP address lookup service | Tools | 2012-07-24 |
| iRail | Belgium train schedules | Transportation | 2011-11-15 |
| Issuu Search | Online publication service | File Sharing | 2009-08-07 |
| ItsThisForThat | Random startup idea generator | Other | 2011-08-10 |
| Ity.im | URL shortening service | Utility | 2011-01-21 |
| Jack Media | Australian daily deals network | Shopping | 2012-07-18 |
| JailBase | Mugshot and Arrest Information for County Jails | Search | 2012-03-07 |
| Johns Hopkins University Hub | Research article retrieval service | Education | 2013-05-08 |
| Junction Networks Web Services | Business VoIP Services | Telephony | 2011-01-11 |
| Khan Academy | Online learning and instruction platform | Education | 2012-06-29 |
| KickoffLabs | Viral referral page service | Social | 2012-02-08 |
| Kippt | Bookmarking application | Bookmarks | 2012-04-02 |
| KIT Video | Video storage, encoding, and broadcast platform | Video | 2012-01-17 |
| Kiva | Person-to-person micro-lending service | Financial | 2009-02-03 |
| Klout | Social metrics service | Internet | 2009-05-08 |
| KPI Dashboard | Business information service | Enterprise | 2010-10-01 |
| Kundo | Customer service and feedback service | Enterprise | 2012-02-22 |
| Kwout | Website quote with images tool | Tools | 2011-08-23 |
| LairOut | Event Search Service | Events | 2013-02-25 |
| Lauerfac.es | Christopher Lauer avatar platform | File Sharing | 2012-05-22 |
| LetsMT | Language translation service | Tools | 2012-03-12 |
| Librarious | Personal collection catalog | PIM | 2011-01-21 |
| Library of Congress Prints & Photographs | Image search service | Media Search | 2011-12-23 |
| LifeDesks | Online science and taxonomy community | Reference | 2011-08-09 |
| Business social networking platform | Social | 2007-12-10 | |
| LittleShoot Labs MIME | File type reference service | Tools | 2010-11-03 |
| Livestream | Video Streaming Tools | Video | 2010-12-20 |
| LobbyFacts Data | European Union lobbyist information service | Politics | 2013-01-03 |
| Loggr | Web application analytics service | Tools | 2011-09-22 |
| Long URL Please | Shortened URL expanding service | Internet | 2009-12-04 |
| LongURL | URL expanding service | Internet | 2008-11-16 |
| Luzme | Ebook price data engine | Shopping | 2011-04-11 |
| LYRICSnMUSIC | Music and song lyric search engine compiler | Music | 2012-12-28 |
| Malmöfestivalen | Malmö Festival schedule and information | Events | 2011-11-25 |
| map4app | Map integration service | Mapping | 2011-10-26 |
| MapAlerter | Irish multi-channel alert service | Messaging | 2013-01-14 |
| MapBox | Mapping Service | Mapping | 2011-10-25 |
| MapQuest Directions | Driving directions service | Mapping | 2010-11-16 |
| MapQuest Geocoding | Forward and Reverse Geocoding Service | Mapping | 2010-11-22 |
| MapQuest Nominatim Search | Geographic search service | Mapping | 2010-11-22 |
| MapQuest Open Directions | Driving directions service | Mapping | 2010-11-15 |
| MapQuest Open Elevation | Elevation data service | Mapping | 2010-11-22 |
| MapQuest Open Guidance | Mobile navigation service | Mapping | 2011-01-25 |
| MapQuest Search | Geographic search service | Mapping | 2010-11-22 |
| MapQuest Traffic | Traffic report service | Mapping | 2010-11-16 |
| Markit Data | Market Data Service | Financial | 2012-08-21 |
| Mashery | API delivery and management service | Internet | 2010-12-21 |
| Mesagraph | Social TV content aggregator | Social | 2011-05-10 |
| MetaCPAN | Perl module search service | Internet | 2012-08-31 |
| Meteor Solutions | Social marketing engagement platform | Advertising | 2012-08-28 |
| Metro Realtime | Los Angeles Metro real-time vehicle location | Transportation | 2011-10-11 |
| Metro Transit NexTrip | Minnesota Transit information service | Transportation | 2012-01-17 |
| Mgnet.me shortener | torrent magnet URL shortening tool | File Sharing | 2012-05-17 |
| Mibbit | Chat client | Chat | 2011-05-20 |
| MineBans | Global Minecraft banning system | Games | 2013-05-14 |
| Minube | Social travel recommendation site | Travel | 2010-11-01 |
| Mixcloud | Radio, DJ, and Podcast Hosting Service | Music | 2011-02-08 |
| Mombo | Social movie review service | Social | 2010-08-27 |
| Monoloop | Social profile and communication service | Social | 2012-06-27 |
| MotorsportReg.com | Motorsports events and calendar service | Sports | 2010-03-31 |
| Muselia | Museum mapping service | Education | 2010-01-27 |
| Musescore | Sheet music sharing service | Music | 2011-12-13 |
| MyGene.Info | Annotated gene information service | Science | 2012-03-26 |
| Myna | A/B testing service | Internet | 2013-01-03 |
| MyWot | Website reputation service | Security | 2010-12-08 |
| Nature.com OpenSearch | Scientific publication search service | Search | 2013-01-02 |
| Navnelabarotoriets (Name Laboratory) | Dutch baby name recommendations | Recommendations | 2011-11-25 |
| NBIC Peregrine | Term recognition and tagging service | Tools | 2012-03-27 |
| Needish | Price quote service | Recommendations | 2009-03-06 |
| Nephics European VAT Number Validation | EU VAT information exchange system | Government | 2012-06-11 |
| Nestoria | UK real estate listings | Real Estate | 2006-07-29 |
| Netvibes | Personalized home page with widgets | Widgets | 2006-11-05 |
| New York Times Campaign Finance | U.S. campaign finance data | Government | 2008-10-14 |
| New Zealand Post Tracking | New Zealand parcel tracking service | Utility | 2012-01-16 |
| NOAA ERDDAP | Oceanic science data service | Science | 2011-12-19 |
| NodePing | Website and server monitoring service | Security | 2013-04-12 |
| Nokia Music | Music content service | Music | 2013-02-06 |
| Notifixio.us | XMPP pubsub notification platform | Internet | 2008-10-31 |
| NPR | US National Public Radio | News | 2008-07-15 |
| Numbers | Number reference service | Reference | 2012-03-16 |
| OCLC Virtual International Authority File | Library authority file service | Tagging | 2011-11-01 |
| Octopart Electronics | Electronics parts search services | Shopping | 2008-12-29 |
| OffeneDaten | Germany open government data | Government | 2012-01-05 |
| olpcMAP | Education technology mapping service | Mapping | 2011-12-19 |
| OnSugar | Blogging service | Blogging | 2011-01-25 |
| Open Beer Database | Database of beer and brewery information | Food | 2012-12-11 |
| Open Dems Polling Place | Polling place location service | Government | 2012-05-23 |
| Open Exchange Rates | Real-time/historical currency exchange rates for developers | Financial | 2012-08-17 |
| Open Government Data Initiative | Government data resource from Microsoft | Government | 2009-09-30 |
| Open Library | Library data access | Reference | 2008-05-07 |
| Open North Represent | Database and API for Canadian elected officials | Government | 2012-06-19 |
| Opencaching.us | US geocaching database | Games | 2013-01-09 |
| OpenCNAM | Caller ID data provider | Telephony | 2012-10-22 |
| OpenCorporates | Corporate information database | Reference | 2012-01-05 |
| opengov.es | Spain open government data | Government | 2011-12-23 |
| opengov.fi | Finland open government data | Government | 2011-12-23 |
| OpenGovernment | State and local government data | Government | 2011-12-06 |
| OpenKeyval | Open key-value data storage service | Storage | 2012-04-18 |
| OpenThesaurus | Open source German thesaurus | Dictionary | 2012-01-11 |
| Panoramio | photo upload site with organizer and geolocation | Photos | 2007-06-12 |
| ParkWhiz | Access to parking and event data | Database | 2010-08-31 |
| Pearson Correlation Coefficient | Calculator for the Pearson Correlation Coefficient ρ | Tools | 2011-02-22 |
| Pelagios | Ancient world geodata | Mapping | 2012-06-05 |
| Pictobar | Crowd sourced personality information service | Social | 2012-11-30 |
| Plancast | Social event service | Social | 2010-12-07 |
| Playme | Music streaming, download, radio and playlist service | Music | 2009-11-13 |
| Playnice.ly | Bug tracking service | Tools | 2011-09-27 |
| PLoS Search | Scientific literature search service | Reference | 2011-06-13 |
| Poligraft | Political Entity Extraction Service | Government | 2010-08-26 |
| Ponyfac.es | My Little Pony avatar platform | File Sharing | 2012-05-22 |
| Popyoular | Review-based recommendation platform | Recommendations | 2013-05-14 |
| Posterous | Content sharing service | Social | 2009-04-20 |
| PostRank | Social engagement data analysis service | Feeds | 2008-07-19 |
| Powerhouse Museum Collection | Online museum collection and datasets | Education | 2011-10-11 |
| Printzel | Photo book creation service | Photos | 2013-04-19 |
| Project Kenai | Collaborative open source development cloud | Project Management | 2012-08-30 |
| Project Kenai SunCloud | Open Source Project Collaboration and Management Service | Project Management | 2012-09-21 |
| Proofeditors.com | URL shortener with security features | Internet | 2012-10-29 |
| ProperSpell | Spelling suggesting service | Dictionary | 2011-01-10 |
| ProPublica Forensics | Geographic autopsy data | Government | 2012-11-19 |
| ProPublica Free the Files | Political ad funding tracking project | Politics | 2012-11-19 |
| Prototype GeoIP | IP-to-location service | Internet | 2011-02-03 |
| PubNub | Push messaging service | Messaging | 2012-03-16 |
| Punchfork Recipe | Realtime recipe aggregator service | Food | 2011-07-12 |
| PunchTab | Customer loyalty program | Other | 2011-10-25 |
| Quotes on Design | Random Quote Generator | Other | 2010-12-29 |
| Qwiki | Interactive wiki with media | Search | 2011-09-15 |
| Rakuten | Japanese shopping web service | Shopping | 2007-06-29 |
| Rapportive | Contact information add-on for email | 2012-02-10 | |
| Reality Digital OPUS | Social media management service | Social | 2011-07-11 |
| Regator Semantic | Content aggregator and analysis service | Internet | 2012-07-23 |
| RequestBin | HTTP request analysis service | Internet | 2013-01-31 |
| RhymeBrain | Online rhyming dictionary | Dictionary | 2011-05-31 |
| Richmond Sunlight | Virginia general assembly information aggregator | Government | 2010-12-21 |
| Roleplayer's Online Dice Roller | Dice rolling tool for roleplayers | Games | 2012-11-29 |
| Roll the Dice | Dice rolling tool | Tools | 2012-11-30 |
| Safe.mn | URL shortening service with security features | Internet | 2010-04-30 |
| SC2Ranks | Starcraft 2 player rankings | Games | 2012-11-05 |
| SciBite | Drug discovery information service | Medical | 2013-05-20 |
| Scotty App | Mobile application backend service | Backend | 2012-02-10 |
| ScraperWiki | Screen scraper wiki | Tools | 2010-08-23 |
| SeatGeek | Tickets search service | Events | 2011-03-18 |
| Seatwave | Online marketplace for live events | Entertainment | 2012-02-28 |
| SeedFinder | Cannabis strain information service | Reference | 2011-09-02 |
| SerialStamper | Registering and Digitally Timestamping Files | Security | 2012-08-29 |
| ServiceU | Event and donation management service | Events | 2013-02-19 |
| SetGetGo IP Geolocation | IP geolocation by country | Tools | 2012-11-30 |
| SetGetGo Random Word | Random word generator | Tools | 2012-12-04 |
| SetGetGo Simple Crypto | Encryption and decryption tool | Tools | 2012-12-04 |
| Shared Count | Social Network Tracking Service | Social | 2011-04-13 |
| SharedCount | Social URL analytics | Internet | 2013-04-22 |
| ShareFile | File sharing and FTP service | File Sharing | 2012-02-07 |
| Shopzilla | Online shopping content | Shopping | 2008-01-04 |
| Shotgun | Creative studio pipeline service | Project Management | 2013-03-03 |
| Silo Breaker | News and information service | News | 2011-07-19 |
| SimpleGeo | Location services platform | Mapping | 2010-03-31 |
| SimplePie Live | Access RSS and Atom feeds with JavaScript | Feeds | 2008-01-29 |
| SkyBiometry Face Detection and Recognition | Face detection and recognition service | Photos | 2012-10-12 |
| SlideSix | Presentation sharing service | Office | 2009-03-19 |
| SocketLabs Email On Demand | Hosted on demand email service | 2010-03-24 | |
| Solve360 | Online CRM service | Enterprise | 2010-03-05 |
| SoundCloud | SoundCloud is a social audio platform | Music | 2008-07-10 |
| SpacialDB Layers | Cloud-based geospatial database | Database | 2012-05-30 |
| Spearman Correlation Coefficient | Mathematics tool | Tools | 2012-05-16 |
| Spell Out | Voice procedural alphabet translator | Tools | 2013-02-19 |
| Springer | Scientific journal and books database | Reference | 2010-12-15 |
| Springpad | Notebook and notes application service | Office | 2011-08-23 |
| Stack Exchange | Question and answer site network | Answers | 2012-10-09 |
| Stack Overflow | Programming question and answer site | Answers | 2010-06-14 |
| stdicon | Icons for standard site or file types | Internet | 2009-11-29 |
| StorageRoom | Cloud based mobile data CMS | Storage | 2011-06-07 |
| Storenvy | Online marketplace and store creation service | Shopping | 2012-08-13 |
| Subsonic | Music streaming service | Music | 2011-07-28 |
| Sunlight Labs Real-time Congress | Near Real-Time Information on the Current Congress Session | Government | 2011-02-15 |
| Surescripts Million Hearts Risk Check Locator | Cardiovascular screening search | Medical | 2012-08-09 |
| TalentBin | Social recruiting service | Social | 2012-05-22 |
| Tapir | Blog search service | Feeds | 2012-10-11 |
| TasteKid | Taste discovery service | Recommendations | 2010-12-29 |
| TaxiFareFinder | Taxi Fare Finding Service | Transportation | 2012-12-05 |
| TechSavvy | Technology job listing site | Job Search | 2012-11-16 |
| The Easy API | Access multiple API's with one easy to use POST | Tools | 2010-03-08 |
| The Giving Lab | Charity and fundraising platform | Tools | 2012-08-29 |
| The Movie DB | Movie, cast and image database | Entertainment | 2010-06-16 |
| TheyWorkForYou | Track the UK Parliament | Government | 2007-02-26 |
| This Is My Jam | Music recommendation and sharing service | Music | 2012-07-16 |
| Tiny GeoCoder | Geocoding services | Mapping | 2008-12-14 |
| to.ly | URL shortening tool | Utility | 2011-07-05 |
| TradeHill | Internet commodity trading service | Financial | 2011-07-05 |
| TradeKing | Stock trading and investment service | Financial | 2011-05-20 |
| Trail | Outdoor Recreation Info | Sports | 2012-08-21 |
| Travel IQ | German travel booking service | Travel | 2011-10-18 |
| Travis CI | Continuous integration service | Internet | 2012-07-20 |
| Trendspottr | Social media trend monitoring and search service | Social | 2012-04-26 |
| Trunk.ly | Bookmarking service based on social link sharing | Bookmarks | 2011-03-21 |
| Tube Updates | Unofficial London transit service | Transportation | 2011-02-28 |
| Twake | Consumer recommendation service | Recommendations | 2012-06-06 |
| TweepSearch | Twitter profile search services | Social | 2010-03-01 |
| Tweetmeme | Twitter link popularity service | Social | 2009-04-03 |
| Twicsy | Twitter Picture Search | Search | 2011-06-14 |
| TwitchTV | Video game broadcasting and chat community | Social | 2012-08-07 |
| TxtBear | Document Publishing Service | Tools | 2013-04-15 |
| Tynt | Internet engagement measurement service | Internet | 2010-11-29 |
| UK Postcodes | UK postcode lookup service | Reference | 2010-08-24 |
| UNICEF 50/50 | International fund raising service | Payment | 2012-02-14 |
| University of Reddit | Collaborative learning community | Education | 2013-04-18 |
| University of Warsaw | University and student information for Poland universities | Education | 2012-07-02 |
| Univision | Spanish language content provider | Entertainment | 2011-12-08 |
| UNLV Library | Library catalog | Reference | 2011-01-21 |
| Unofficial BMYcharity | Online giving and donations service | Financial | 2012-02-22 |
| Unofficial Fitocracy | Social fitness platform | Games | 2012-02-22 |
| Unofficial Hacker News | News and comment service | News | 2010-09-22 |
| Unofficial IMDb | Unofficial search interface for Internet Movie Database (IMDb) | Reference | 2011-07-28 |
| Unofficial Virgin Money Giving | Online giving and donations service | Financial | 2012-02-22 |
| Unshort.me | Link unshortening service | Internet | 2011-08-01 |
| Uptime Robot | Website monitoring service | Tools | 2012-08-06 |
| Urban Airship | Mobile push notification platform | Messaging | 2010-03-24 |
| US Census Bureau | US Census data service | Government | 2012-06-07 |
| USC Event Calendar | Campus event calendar | Calendar | 2013-05-13 |
| USC Map Data | Campus map data | Mapping | 2013-05-13 |
| USC Webcam | Campus webcam video and still photo access | Video | 2013-05-13 |
| USOS | Information management system for Polish universities | Education | 2013-04-18 |
| ValueCommerce Product | Online shopping service | Shopping | 2011-02-22 |
| ValueCommerce Travel | Travel web service | Travel | 2011-02-22 |
| Verisign DomainView | Domain registration trend tool | Internet | 2012-11-12 |
| Viddler | Online video service | Video | 2008-09-03 |
| VideoSurf | Video search service | Video | 2009-05-26 |
| ViewText | Online text scraping service | Tools | 2010-09-27 |
| VigLink | VigLink Affiliation Service | Advertising | 2011-05-17 |
| Viki | Global Television Service | Video | 2012-12-18 |
| Vimeo | Video sharing service | Video | 2007-09-16 |
| Vote.ca Districts | Canadian Voting Place Locator Service | Government | 2011-02-28 |
| Washington Metro | Washington DC Metro data service | Transportation | 2012-01-13 |
| Washington Post NFL Statistics | National Football League (NFL) statistics service | Sports | 2012-06-26 |
| Washington State Corporations Search | Washington state corporations search service | Search | 2011-10-03 |
| Wassr | Twitter for SecondLife microblogging service | Blogging | 2008-12-21 |
| Weather Source | Weather data service | Weather | 2013-05-09 |
| Web2PDF | PDF creation service | Office | 2010-08-13 |
| WebSEOAnalytics | SEO analytics service | Internet | 2011-08-15 |
| Wego | Travel search service | Travel | 2012-03-27 |
| Wellynews | Wellington New Zealand news search | News | 2009-08-27 |
| WePay | Online payment service | Payment | 2010-12-29 |
| WikiLocation | Find Wikipedia articles based on location | Wiki | 2011-02-28 |
| Wikimapia | Editable interactive maps | Mapping | 2011-04-21 |
| WMATA | DC Transit Service | Government | 2010-08-30 |
| Wookmark | Image collection and sharing service | Social | 2012-12-07 |
| WordReference | Multilingual dictionary definition service | Dictionary | 2012-01-31 |
| Wordstream Keyword Niche Finder | Keyword suggestion service | Search | 2010-04-14 |
| Wordstream Keyword Tool | Keyword suggestion service | Search | 2010-05-05 |
| Workbooks | CRM for small businesses | Enterprise | 2011-04-14 |
| World Addresses | Address lookup and verification service | Reference | 2011-11-02 |
| World Bank | Worldwide indicators, business, and photo databases | Reference | 2008-08-31 |
| World of Warcraft | World of Warcraft data service | Games | 2011-08-23 |
| World Weather Online | Global weather information services | Weather | 2010-03-19 |
| WorldCat Identities | Library data access | Reference | 2008-08-13 |
| WorldCat xISBN | ISBN and book edition linking service | Reference | 2011-12-06 |
| WPAPI.org | Blog statistics service for WordPress blogs | Blogging | 2009-11-29 |
| Yahoo Meme | Microblogging platform | Blogging | 2010-01-14 |
| Yahoo Query Language | Query language platform for Yahoo services | Database | 2008-12-05 |
| Yahoo YUI | Web visualization and layout framework | Internet | 2012-01-05 |
| Yandex Rich Content | Webpage metadata delivery tool | Internet | 2013-02-27 |
| Yandex Speller | Find and fix spelling mistakes | Tools | 2011-02-28 |
| Yandex Translate | Free text translation service | Tools | 2013-02-25 |
| Yes Broadcast DB | Radio station search, now-playing, logs and charts | Music | 2008-11-06 |
| YIFY-Torrents | Movie torrent site | File Sharing | 2013-05-23 |
| Yolink | Semantic search | Search | 2010-07-11 |
| Yonda4 | Reading lists and recommendations | Recommendations | 2011-05-25 |
| zanox | Internet monetization services | Advertising | 2008-11-15 |
| Zappos | Online retail store | Shopping | 2010-06-17 |
| Zendesk | Help desk service | Internet | 2009-06-08 |
| Zoom.it | Photo conversion and sharing service | Photos | 2010-12-17 |
| Zootle | Sales, inventory, and contact management service | Enterprise | 2013-01-18 |
| Zootool | Online Bookmarking and Collecting Service | Bookmarks | 2011-02-03 |
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