Where I've Been

Where I've Been offers a REST based API which allows third parties to gain access to their user base of millions of social travelers.
Where I've Been

Socialtext

Socialtext provides enterprise social software to businesses with the goal of improving knowledge management and sharing. The Socialtext REST API includes a set of functionality allowing programmers to create, read, update, and delete much of the data in the Socialtext systems. This includes tags, pages, attachments, workspaces, users, Signals, and search results. There is also a SOAP interface to content hosted in Socialtext workspace.
Socialtext

Retro Avatar

This API creates a unique random pixel image with a retro look for a given seed value. These values can be name, email, profile id and more.
Retro Avatar

Zoho Projects

Zoho Projects provides REST style Web APIs that return an XML or JSON document over HTTP. With this API, users/developers can extend their web applications to push or pull data into or from Zoho Projects for application mashups. As the API is purely HTTP based, your application could be in any of the programming languages like Java, Python, ASP etc., to use the same. Zoho Projects offers planning and reporting capabilities, and makes the process social by bringing everyone in your project team together and helping them get the project done.
Zoho Projects

Straight-Street

This is a RESTful API for the straight-street.com symbol set. It allows programs to search and access symbols, just as users can using the interactive gallery web page.
Straight-Street

WPAPI.org

WPapi is an API that gives you access to up-to-date download stats for your WordPress-hosted plugins and themes using feeds such as JSON, XML, CSV and PHP. You can use this data on your own blog or website for displaying graphs or other visualizations.
WPAPI.org

RdbHost

RdbHost creates a database using the PostgreSQL engine exclusively for your use. First you need to create an account, then you will get a database that can be accessed via HTTP requests and regular SQL.
RdbHost

Victoria & Albert Museum

The Victoria & Albert Museum API is designed as a RESTful interface to our collections and what we know about them. It returns all items in the database (paginated) in XML or JSON format. The purpose of the V&A API is to maximise access to all our collections and encourage use of them.
Victoria & Albert Museum

Nextstop

Nextstop is a community effort to build a catalog of recommendations best things to do and places to visit around the world. The Nextstop API is a REST style API that returns results in the JSON format. Currently available only as a read only API, the nextstop API lets you access all of the original recommendations contained on nextstop.com for purposes of display on your site or application. The APIs can be used to search for relevant content in the nextstop database, or to retreive all available information about a particular place or guide. Nextstop is a community effort to build a catalog of all the best things to do, places to go, and experiences to try anywhere in the world.
Nextstop

MeeMix

MeeMix Web Service enables partners to synchronize their own media libraries with the MeeMix database, and subsequently suggest musical recommendations and playlists to both unregistered and registered users. MeeMix API makes our core technology accessible from virtually every web-integrated device. It supports both SOAP and REST web service protocols. MeeMix services enable businesses to personalize their music and media portals, stores or applications with the goal of optimizing conversion and customer retention and significantly boosting long-tail sales.
MeeMix