The Untappd Ruby SDK by Chris Mar wraps the API to access beers, breweries,and bars features with the aim to implement in social applications. Guides available on GitHub include Api Key, documentation, parameters, methods, and responses.
A project of the Elgg Foundation, Elgg is a free open source social networking engine licensed to users under the GNU Public License v2. The REST Elgg API allows developers to integrate Elgg and offer new apps for it. To give a sense of its size, 1,646 plugins have been created so far by the user community, with nearly 3 million downloads. Examples of plugins include blogs, forums, social bookmarks.
BandPage creates a platform where musicians, fans and others in the music industry can interact easily. For musicians, it can be difficult to stay connected to fans who are scattered all over the web. BandPage aims to rectify this issue by providing musicians with a one-stop-shop solution; update once and publish everywhere. Bands simply create a BandPage profile and all their info is updated across various other online channels as well. The BandPage API allows third party developers to access this data and integrate it into other applications.