| API | Description | Category | Updated |
|---|---|---|---|
| 4:14 XML Bible | Christian bible verse service | Reference | 2012-03-13 |
| Abbreviations | Abbreviated words services | Reference | 2008-08-26 |
| AFD Software Postcode Everywhere | UK address and bank information service | Reference | 2012-10-02 |
| AHDS Identifier Resolver | UK electronic research data repository | Reference | 2011-06-30 |
| AllAreaCodes | Area code lookup service | Reference | 2011-02-23 |
| Amazonca | Online barcode database | Reference | 2011-05-20 |
| American Bible Society BibleSearch | Bible access and search service | Reference | 2011-05-25 |
| Anime News Network Encylopedia | Online Anime Encyclopedia Service | Reference | 2012-11-01 |
| Aonaware Dictionary | Dictionary lookup service | Reference | 2006-11-19 |
| Aqua.io | Standardized healthcare code reference service | Reference | 2013-04-22 |
| Archives Hub | UK research archive | Reference | 2012-11-19 |
| arXiv | Academic research repository | Reference | 2008-05-04 |
| ASPECT Vocabulary Bank for Education | Education vocabulary controlled lists | Reference | 2010-12-17 |
| Attempto RACE | Text-based logical reasoning service | Reference | 2012-07-16 |
| AutoAppMart | In-car application marketplace | Reference | 2010-12-20 |
| Avvo | Lawyer and doctor directory service | Reference | 2011-02-03 |
| Baby Names | International baby naming services | Reference | 2008-07-20 |
| BankHolidays | Swedish banking holiday lookup service | Reference | 2011-02-15 |
| BankLZ | German bankcode lookup service | Reference | 2010-11-09 |
| Barcelona Bicing | Bicing station data | Reference | 2011-05-25 |
| Basic Local Alignment Search Tool | Genome database search tool | Reference | 2011-07-26 |
| Bavarian Authorities Signpost | Local information service for Bavaria | Reference | 2012-11-14 |
| BBAS Personal Data Repository | Semantic data for scientific biographical information | Reference | 2012-09-21 |
| BBAW G2L | Greek-Latin text transliteration service | Reference | 2012-12-31 |
| BBAW ISO-Date | German and Italian text analysis service | Reference | 2012-12-31 |
| BBAW Places | German text analysis and place name service | Reference | 2012-12-31 |
| BBS Scene | Bulletin board system services | Reference | 2011-07-05 |
| Bearmini Public Holiday | Japanese public holiday reference service | Reference | 2012-09-05 |
| Bible.org | Bible passage access | Reference | 2009-09-09 |
| Biblia.com | Online bible reference service | Reference | 2010-03-29 |
| BibServer | Bibliographic metadata consolidation and sharing service | Reference | 2012-02-14 |
| Big Huge Thesaurus | Thesaurus lookup services | Reference | 2008-08-28 |
| BioCatalogue | Life sciences web registry service | Reference | 2011-07-14 |
| BioMOBY | Plant genome reference service | Reference | 2011-09-02 |
| Biomolecular Interaction Network Database | Biomolecular database | Reference | 2011-02-23 |
| Biosemantics JANE | Journal and author name service | Reference | 2012-05-22 |
| Boliven Patents | 100 million Patent and Scientific documents | Reference | 2010-05-05 |
| Boliven Publications | Patent and scientific document portal | Reference | 2011-10-14 |
| Bookshare | Accessible Books For Readers with Print Disabilities | Reference | 2011-01-27 |
| Brain Maps | Brain section images | Reference | 2011-09-06 |
| Brewery DB | Your Complete Brewery and Beer API | Reference | 2011-04-14 |
| Bview Content | Local business info service | Reference | 2010-12-13 |
| Callook | US amateur radio callsign lookup | Reference | 2010-12-29 |
| CalorieKing | Food information service | Reference | 2009-02-19 |
| Cambridge Journals Online | Cambridge University Press collections | Reference | 2013-05-16 |
| Cambridge Lookup/Ibis Web Service | Online Contact Retrieval Service | Reference | 2012-07-13 |
| Cambridge University Library | Library catalog and services | Reference | 2011-10-11 |
| CarJam | New Zealand car facts history service | Reference | 2008-12-27 |
| CarQuery | Automobile information | Reference | 2011-11-19 |
| CatalogWS | Academic library | Reference | 2008-02-07 |
| CDYNE 411 | Directory assistance service | Reference | 2010-11-19 |
| CDYNE Death Index | Access to the Social Security Death Index | Reference | 2009-09-15 |
| CDYNE Demographics | Neighborhood level demographics service | Reference | 2010-11-22 |
| CEERN | Conservation and Environment Resource Database | Reference | 2011-02-08 |
| Cevir Turkish-English Dictionary | Turkish-English Dictionary look up service | Reference | 2010-12-02 |
| Chemcaster | Cheminformatics management platform | Reference | 2009-11-29 |
| China Historical GIS | Chinese history and geography information service | Reference | 2012-01-17 |
| Chinese PostalCodeSearch | Chinese postal code lookup service | Reference | 2012-03-02 |
| CiteULike | Citation management service | Reference | 2011-11-08 |
| City and State by Zip Code | Address lookup service | Reference | 2006-11-19 |
| CityGroups | Local public directory | Reference | 2011-09-13 |
| Clodoc | Clojure programming documentation service | Reference | 2012-04-24 |
| ClojureDocs | Clojure programming language example repository | Reference | 2012-11-28 |
| CommonDataHub | Universal data standards repository | Reference | 2012-08-15 |
| Complexity Intelligence Spell Checker | Spelling correction and recommendation service | Reference | 2010-11-11 |
| Comprehensive Knowledge Archive Network | Community driven open knowledge database | Reference | 2008-07-10 |
| Conversions | Online calculator and measurment converter | Reference | 2010-01-14 |
| Copac SALT recommender | Library resource recommendation service | Reference | 2012-10-31 |
| Cortera | Business information and research data | Reference | 2008-05-01 |
| Cortera Business Vitals | Basic company information web service | Reference | 2008-05-11 |
| Countries and Time Zones | Time zone information service | Reference | 2012-11-16 |
| CraftyClicks UK Postal Address Lookup | UK postcode lookup service | Reference | 2010-04-21 |
| CrossRef DOI Resolver | Persistent identifier resolver | Reference | 2011-10-11 |
| CrunchBase | Directory of companies, people, and investors | Reference | 2008-07-16 |
| CSRHUB | Corporate Social Responsibility ratings database | Reference | 2011-09-26 |
| Cyc | Semantic meaning service | Reference | 2009-10-18 |
| D&B Direct | Commercial business information service | Reference | 2011-10-07 |
| Data Science Toolkit | Open Source tools for science | Reference | 2011-04-15 |
| Data-Planet | Statistical data service | Reference | 2012-04-16 |
| Data8 Companies House | UK company search service | Reference | 2012-06-12 |
| Data8 Movers Identification | Address checking and update service | Reference | 2012-06-13 |
| Datanibble | Quotes generator | Reference | 2008-12-01 |
| DBpedia Spotlight | Semantic Text Annotation and Disambiguation | Reference | 2011-08-22 |
| DCMI Metadata Registry | Metadata management service | Reference | 2013-04-18 |
| DDBC Authority Database | Authoritative Buddhist people, place, and event name service | Reference | 2013-02-14 |
| Deduktiv ebaas distance | UK postcodes service | Reference | 2011-02-28 |
| Deepdyve | Scientific and medical journals | Reference | 2009-11-19 |
| Dictionary Definitions | Online dictionary | Reference | 2010-01-28 |
| Dictionary.com | Dictionary lookup service | Reference | 2010-10-04 |
| Digital Public Library of America | National digital library | Reference | 2013-05-09 |
| DigitalClassicist G-Tool | Greek-to-Latin translation service | Reference | 2012-04-18 |
| DigitalNZ | New Zealand metadata database | Reference | 2009-09-02 |
| Dun and Bradstreet Business Verification | Research company background data | Reference | 2006-09-23 |
| Dun and Bradstreet WorldBase Marketing Plus | Business research services | Reference | 2006-09-23 |
| DuoShare Address Verification | US address verification service | Reference | 2008-09-21 |
| EBI CiteXplore | Scientific publication and metadata retrieval | Reference | 2012-07-24 |
| eBibleicious | Bible lookup service | Reference | 2011-08-12 |
| Ecolabel Index | Ecolabel Database Tools | Reference | 2011-02-28 |
| Edmunds.com Inventory | Specific automobile information via VIN | Reference | 2011-11-02 |
| Edmunds.com Vehicle | Automobile information | Reference | 2011-11-02 |
| Elsevier Article | Scientific journals and articles search service | Reference | 2008-11-16 |
| Elsevier Linked Data Repository | Semantic metadata service | Reference | 2012-12-06 |
| Encyclopedia of Life | Biology Encyclopedia | Reference | 2011-02-28 |
| Enrycher | Text analysis and keyword generation service | Reference | 2012-04-05 |
| ESV Bible Lookup | Bible lookup service | Reference | 2005-09-04 |
| Exploring Surrey's past | Surrey County historical resource | Reference | 2013-02-18 |
| FAO Fisheries and Aquaculture Fact Sheets | Fisheries and aquaculture data service | Reference | 2011-11-23 |
| Fietstas | Document and text processing service | Reference | 2012-08-24 |
| Fillbug | Query by example service | Reference | 2012-02-23 |
| Forvo | Online word pronunciation guide | Reference | 2010-03-25 |
| FraudLabs AreaCodeWorld NPA NXX Area Code | Geographical location service | Reference | 2010-11-17 |
| FreeCite | Bibliographic citations parsing service | Reference | 2012-11-08 |
| Frengly Translation | Text translation service | Reference | 2012-08-17 |
| Freshmeat | Open source application index | Reference | 2011-06-20 |
| FUTEF Wikipedia API | Third party Wikipedia web service | Reference | 2007-01-23 |
| GEMET | Multi-language thesaurus management service | Reference | 2012-05-07 |
| Genability | Electricity price data service | Reference | 2011-04-07 |
| Genetics Home Reference | Genetics research site | Reference | 2011-07-26 |
| GeoNames | Geographic name and postal code lookup | Reference | 2006-01-12 |
| Getpincode | Indian pincode search engine | Reference | 2012-04-13 |
| Global Biodiversity Information Facility | Species datasets | Reference | 2009-06-21 |
| Glocal Focal US Mortality Data | US government mortality data | Reference | 2011-05-20 |
| GMOD | Remote Querying of Biological Databases | Reference | 2011-09-01 |
| Google Books | Book search services | Reference | 2008-09-29 |
| Google Diacritize | Language pronunciation tool | Reference | 2010-11-01 |
| Graydon Company Data Webservice | UK company information database | Reference | 2010-03-31 |
| Gwinnett Roman Baptist Church Open Bible | Bible excerpt service | Reference | 2012-12-31 |
| Hathi Trust Data Distribution | Library catalog search service | Reference | 2010-03-24 |
| Há Greve | Portugese Strike Information | Reference | 2012-12-21 |
| Holidays Service | Holiday dates lookup service | Reference | 2006-10-20 |
| Hosca BankFinder | Find banks by zipcode | Reference | 2012-10-15 |
| I Heart Quotes | Quotes and fortunes generator | Reference | 2008-10-27 |
| iCyte | Resource and document saving service | Reference | 2011-07-28 |
| Idescat Rectifications | Rectifications registry lookup service | Reference | 2010-12-02 |
| iFixit | Online repair manual database | Reference | 2010-12-21 |
| IIAP Servicio Glosario | Spanish glossary of environmental terms | Reference | 2012-10-16 |
| ImpactStory | Publication influence metrics service | Reference | 2012-11-15 |
| Indiana University Knowledge Base | Tech support reference database | Reference | 2013-05-28 |
| InfoChimps Datasets | 2,000+ dataset reference library | Reference | 2011-04-22 |
| InfoChimps IP Intelligence Demographics | Census data based on IP address | Reference | 2011-02-28 |
| Intelius Search | Public records database search | Reference | 2012-05-01 |
| IPInfoDB Fraud Detection | Online fraud detection service | Reference | 2010-02-18 |
| ISBN db | Books database | Reference | 2006-03-01 |
| ISOcat | Linguistic concept definition registry | Reference | 2012-09-10 |
| iTranslate4.eu | European language translation service | Reference | 2012-06-12 |
| Karmadata | Standardized open data resource | Reference | 2013-05-08 |
| Kasabi | Data marketplace | Reference | 2011-05-31 |
| KnowMarkets Address Verification | Postal and area code lookup services | Reference | 2008-07-06 |
| Korean Bible Society | Korean-language Bible | Reference | 2012-10-16 |
| Language Studio Asia Online | Online translation service | Reference | 2012-09-14 |
| Lasso 9 Reference Library | Lasso 9 reference information retrieval service | Reference | 2013-05-01 |
| Lawyers.com | Legal articles archive | Reference | 2011-08-23 |
| Leafly | Medicinal marijuana information service | Reference | 2011-09-01 |
| LexisNexis Academic | Academic research repository | Reference | 2008-12-29 |
| Library of Congress SRW | Information database search | Reference | 2006-03-10 |
| Library of Congress Subject Headings | Access to the Library of Congress Subject Headings | Reference | 2008-04-06 |
| LibraryThing | Books database and community | Reference | 2008-02-09 |
| LifeDesks | Online science and taxonomy community | Reference | 2011-08-09 |
| LinguLab | Text creation and editing service | Reference | 2012-02-22 |
| LocalSchoolDirectory | School information and search service | Reference | 2012-04-25 |
| MaGdev BankSearch | German bank information service | Reference | 2011-12-11 |
| Martindale-Hubbell | Legal directory | Reference | 2011-11-01 |
| MasterCard Merchant Identifier | Merchant data lookup service | Reference | 2012-09-12 |
| Melissa Data Data Quality Suite | Location data lookup and verification services | Reference | 2011-09-22 |
| MetNet | Biological database access service | Reference | 2009-12-10 |
| MetriDyne | Real-time measurement accumulates service | Reference | 2011-01-25 |
| Microsoft MSDN | Technical reference library | Reference | 2006-06-14 |
| Mirlyn | Library catalog and services | Reference | 2011-10-11 |
| Moonshadow Mobile | US population data service | Reference | 2011-11-26 |
| Morpher | Russian language reference service | Reference | 2010-04-15 |
| MSHD.net | Reference information lookup | Reference | 2011-01-18 |
| MTPS Content Service | Access to Microsoft documentation and related content | Reference | 2012-07-25 |
| myExperiment | Workflow sharing services | Reference | 2008-11-15 |
| MyFonts | Font store | Reference | 2012-01-09 |
| NADA | Used car values lookup service | Reference | 2012-04-19 |
| NASA Astrophysics Data System | Astronomy and physics data service | Reference | 2012-07-12 |
| NCSU Libraries CatalogWS | Library catalog and services | Reference | 2011-10-11 |
| NCSU Scholarly Publications Repository | Academic publication information service | Reference | 2012-06-06 |
| Neil deGrasse Tyson Quotes | Neil deGrasse Tyson Quotes | Reference | 2012-08-16 |
| NextBio | Science data research platform | Reference | 2011-06-16 |
| Ningbo Institute of Technology SOIP | Open API for Searching the NIT Information Portal | Reference | 2011-01-21 |
| Numbers | Number reference service | Reference | 2012-03-16 |
| O'Reilly Product Metadata Interface | Book and publishing industry metadata interface | Reference | 2010-03-05 |
| Obituarydata.com | Obituary data archive | Reference | 2013-06-19 |
| Ockham Spell | Spelling suggestion service | Reference | 2012-11-08 |
| OCLC Article Exchange | Library document sharing service | Reference | 2012-07-16 |
| OCLC Classify | Library catalog classification service | Reference | 2011-01-25 |
| OCLC WMS | Library collection management services | Reference | 2012-09-10 |
| OMA Browser | Proteins search engine | Reference | 2011-09-06 |
| OMG | Computer industry standards database | Reference | 2012-10-25 |
| ONKI Ontology and Thesaurus | Finnish library thesaurus and ontology service | Reference | 2012-03-12 |
| Open Charge Map | Electric vehicle charging point database. | Reference | 2011-05-13 |
| Open Library | Library data access | Reference | 2008-05-07 |
| OpenCorporates | Corporate information database | Reference | 2012-01-05 |
| OReilly Safari | Book search | Reference | 2005-09-04 |
| Pearson Longman Dictionary | English dictionary reference source | Reference | 2011-08-17 |
| Pearson Peachpit Visual QuickStart Guides | Visual QuickStart Guide | Reference | 2012-08-20 |
| PhoneVal | Phone number validation service | Reference | 2006-12-18 |
| PicketReport Lifestyle | Neighborhood lifestyle data service | Reference | 2012-03-19 |
| PilotOutlook | International airport data | Reference | 2008-04-12 |
| Pincodr | Indian pincode search service | Reference | 2012-11-16 |
| PLoS Search | Scientific literature search service | Reference | 2011-06-13 |
| Postcode Anywhere Customer Profiling | UK population segmentation data service | Reference | 2011-03-09 |
| Postcode Anywhere Worldwide Business Data | Business record database | Reference | 2011-03-08 |
| Postcode IT | Get addresses from postcodes | Reference | 2009-12-05 |
| PostcodePal | Geographic datasets for the United Kingdom and Crown Dependencies | Reference | 2013-04-15 |
| Pro6PP | Dutch postcode database services | Reference | 2012-11-06 |
| Project Bamboo | Humanities research support service | Reference | 2012-09-27 |
| PRONOM | Electronic records management technical information database | Reference | 2012-12-19 |
| PubChem PUG | Molecular library database | Reference | 2011-07-26 |
| PubMLST | Biological database | Reference | 2011-02-23 |
| Pulsepoint Real-Time Classifier | Context definition and classification service | Reference | 2012-11-16 |
| Python Package Index | Python code database | Reference | 2011-12-23 |
| Qualified Address | US address verification service | Reference | 2008-07-02 |
| Quotations Book | Quotations database | Reference | 2011-06-24 |
| RadioReference | Radio station database | Reference | 2010-10-21 |
| Random House | Book search and viewing service | Reference | 2007-08-15 |
| RealEDA Reverse Phone Lookup | Lookup address and name via phone | Reference | 2006-10-31 |
| RealSearch Liberty Criminal | Criminal records search service | Reference | 2011-05-25 |
| RealSearch Wireless & Cellphone | Wireless carrier database | Reference | 2011-05-25 |
| Record Setter URDB | World record reference site | Reference | 2011-10-04 |
| refbase OpenSearch | Bibliographic search service | Reference | 2012-10-04 |
| ReferralCandy | Customer referral service | Reference | 2012-05-21 |
| RegExLib | Database of regular expressions | Reference | 2012-07-05 |
| RestFul Web Services Bible | Bible verse look-up service | Reference | 2012-08-03 |
| RestFul Web Services Postal Code | International postal code look-up service | Reference | 2012-08-03 |
| Reverse Australia | Australian reverse phone lookup service | Reference | 2011-01-13 |
| RIPE Database | Internet Registry Database | Reference | 2011-06-20 |
| Ripe Development | Local time and zip code information services | Reference | 2013-02-14 |
| RubyGems | Ruby community gem hosting service | Reference | 2011-10-07 |
| Sapo POI | Location data service | Reference | 2012-04-26 |
| Sapo Semantic Lists | Semantic word lists service | Reference | 2012-05-04 |
| Sapo Verbetes | WhoIs query service for public figures | Reference | 2012-05-03 |
| Scholarly iQ | Scholarly publication tracking service | Reference | 2012-12-19 |
| Scholarometer | Scholar impact rating service | Reference | 2012-11-30 |
| SciVerse Framework and Content | Science Reference Research Platform OpenSocial | Reference | 2010-11-29 |
| Scopus | Academic citation database | Reference | 2008-03-25 |
| SeedFinder | Cannabis strain information service | Reference | 2011-09-02 |
| Sem4Tags | Semantic tagging interpretation service | Reference | 2012-06-13 |
| Semantics3 | Product Database | Reference | 2012-10-05 |
| Sensis Business Search | Australian business directory search service | Reference | 2011-09-26 |
| SermonAudio | Audio sermon library service | Reference | 2011-07-14 |
| SERP-P | Philippines demographic data service | Reference | 2012-02-22 |
| ServiceObjects DOTS Demographics | Zip code level demographic service | Reference | 2011-08-08 |
| ServiceObjects DOTS NCOA Live | U.S. change-of-address (COA) update service | Reference | 2012-11-29 |
| Shakespeare | Shakespearian play quote origin identification service | Reference | 2012-01-06 |
| Sherpa Romeo | Journal publishing service | Reference | 2009-04-27 |
| SHOUTcast Radio | Internet radio database service | Reference | 2010-12-14 |
| SigQuotes | Random Alistair Young quote generator | Reference | 2012-02-07 |
| SimpleUPC | Product information database | Reference | 2011-07-05 |
| Simply Postcode | Postcode and address lookup service | Reference | 2012-06-13 |
| Simunix T2A | Directory services providing UK people, address, telephone and company information | Reference | 2011-08-04 |
| SKGA Golf Hadicap | Golf handicap in Slovakia | Reference | 2012-09-06 |
| SKOS Thesaurus | Thesaurus of related concepts | Reference | 2012-05-11 |
| Softonic | Catalog of downloadable software | Reference | 2010-12-03 |
| SolarGIS | Solar resources information and calculation services | Reference | 2012-10-25 |
| Spellchecker.net | Spelling correction service | Reference | 2011-04-26 |
| Springer | Scientific journal and books database | Reference | 2010-12-15 |
| SRC Demographics | Demographic reference data | Reference | 2006-06-13 |
| St. Gregorios Church Bible | Bible verse retrieval service | Reference | 2012-03-13 |
| State Library of New South Wales | Internal library website maintenance and fundraising service | Reference | 2012-12-31 |
| StrikeIron Address Verfication | Global address verification service | Reference | 2006-10-20 |
| StrikeIron Do Not Call | Telephone number verification serice | Reference | 2006-09-23 |
| StrikeIron Insider Trading | Insider trading transaction information | Reference | 2006-10-08 |
| StrikeIron Lite Web Services | Financial, census data, phone numbers, and other data | Reference | 2008-05-11 |
| StrikeIron Phone Number Enhancement | Adds address and statistical data based on phone number | Reference | 2006-11-24 |
| StrikeIron Residential Lookup | Residential directory lookup and validation service | Reference | 2006-11-12 |
| StrikeIron Reverse Phone Lookup | Reverse phone lookup services | Reference | 2006-09-14 |
| StrikeIron Sales Tax Basic | Sales and use tax data service | Reference | 2006-12-08 |
| StrikeIron Super Data Pack | APIs for variety of reference data sources | Reference | 2007-01-30 |
| StrikeIron Tax Service | Sales tax reference lookup | Reference | 2006-08-29 |
| StrikeIron US Census | Census data information service | Reference | 2006-10-08 |
| StrikeIron Zacks Company Profile | Corporate profiles web service | Reference | 2006-11-29 |
| Styfee | Internalization and localization services | Reference | 2013-05-02 |
| Synonyms | Online thesaurus | Reference | 2009-12-10 |
| TextRazor | Text analysis service | Reference | 2013-02-25 |
| The Business Model Project | Business model taxonomy | Reference | 2012-10-24 |
| The Society of Authors Member Search | Search for a writer or translator | Reference | 2013-02-12 |
| Thesaurus | Multi-languages thesaurus search service | Reference | 2010-05-17 |
| Thirukkural | Thirukkural reference service | Reference | 2012-04-19 |
| Thomas Beyer First Names and Gender | European names lookup service | Reference | 2011-08-16 |
| Thomson Reuters Knowledge Direct | Business information and analytics | Reference | 2010-04-23 |
| Thomson Reuters Pharma | Investigational drugs data | Reference | 2011-04-21 |
| Thomson Reuters Web of Science | Citation reference index | Reference | 2012-02-08 |
| Timetric | Statistical analysis tools and data | Reference | 2009-08-13 |
| TimeZoneDb | Time zone database | Reference | 2011-11-15 |
| Tixik | Famous places GPS services | Reference | 2008-08-22 |
| Translated.net | Professional translation workflow service | Reference | 2012-08-17 |
| U.S. National Library of Medicine ChemSpell | Chemical name spell checker and thesaurus | Reference | 2013-04-15 |
| UK Postcodes | UK postcode lookup service | Reference | 2010-08-24 |
| UMBEL | Semantic structure service | Reference | 2010-11-10 |
| Unified Tax | Sales tax lookup service | Reference | 2012-06-08 |
| University of Toronto Libraries | University of Toronto's library management system | Reference | 2012-05-11 |
| UNLV Library | Library catalog | Reference | 2011-01-21 |
| Unofficial IMDb | Unofficial search interface for Internet Movie Database (IMDb) | Reference | 2011-07-28 |
| UrbanDictionary | Slang dictionary lookup | Reference | 2005-10-31 |
| Urbanesia | Indonesian city lifestyle directory | Reference | 2012-07-26 |
| USA Today Best-Selling Books | Best-Selling Books Information Service | Reference | 2010-12-10 |
| USA Today Census | U.S. census search service | Reference | 2011-06-08 |
| USGS Greenness Query | Geological data service | Reference | 2011-08-29 |
| USGS United States National Grid Conversion | Geological data service | Reference | 2011-08-29 |
| Visual DataFlex Country Information | Country information service | Reference | 2012-05-15 |
| Visual DataFlex Date Functions | Multi-language ID code and date name retrieval | Reference | 2012-05-10 |
| WareNet CheckWare | Hardware product database | Reference | 2011-06-16 |
| WattzOn | Online Power Usage Tracking | Reference | 2011-03-24 |
| WebLaws | Legal glossary | Reference | 2009-12-10 |
| WebServiceMart Phone3T | Phone number validation service | Reference | 2012-07-25 |
| WebServiceMart USZip | Zipcode validation service | Reference | 2012-07-25 |
| WhitePages.com | People search service | Reference | 2008-03-31 |
| Wiki-Data | Company/business entity data service | Reference | 2011-10-11 |
| Wikimeta | Semantic tagging and content annotation service | Reference | 2012-02-14 |
| Wikipedia | Online collaborative encyclopedia | Reference | 2008-09-05 |
| Wikirandom | Generate Random Wikipedia Pages | Reference | 2011-03-24 |
| Wolfram Alpha | Computational knowledge and search engine | Reference | 2009-05-16 |
| Wordnik | Dictionary, spelling, and other word reference | Reference | 2009-11-09 |
| World Addresses | Address lookup and verification service | Reference | 2011-11-02 |
| World Bank | Worldwide indicators, business, and photo databases | Reference | 2008-08-31 |
| World Bank Climate | Climate change information portal | Reference | 2012-02-22 |
| World Weather Online City Search | City lookup service | Reference | 2011-01-21 |
| World Weather Online Time Zone | Time zone data service | Reference | 2011-01-21 |
| World Wide Web of Humanities Wayback | Archived internet research service | Reference | 2010-05-13 |
| WorldCat Identities | Library data access | Reference | 2008-08-13 |
| WorldCat Search | Library data access | Reference | 2008-08-13 |
| WorldCat xISBN | ISBN and book edition linking service | Reference | 2011-12-06 |
| Worldwide Lexicon | Open source, collaborative language translation service | Reference | 2012-06-12 |
| WSIndex | Index of informational links on web services | Reference | 2013-04-18 |
| Xhanch Islamic Get Prayer Time | Islamic prayer time calculating service | Reference | 2011-10-24 |
| Yahoo Spelling Suggestion | Spelling correction service | Reference | 2010-02-15 |
| York University Library | University library data service | Reference | 2012-11-08 |
| ZIP Codes | Zip code lookup service | Reference | 2009-12-08 |
| ZoomInfo | Information search services | Reference | 2007-09-27 |
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