The Tweetinvi C#/.NET library provides access to the Twitter REST and Streaming APIs. This unofficial library offers 3 different classes for Messages, Twitter Users, and Tweets. Tweetinvi also offers Streaminvi, for access to the Twitter Streaming API. The Streaminvi library has two classes, SimpleStream for all the data provided by Twitter, and FilteredStream for extracting specific data from Twitter. The Tweetinvi library is offered under a Microsoft Public License (Ms-PL).
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.
Well over 600,000 developers participate in a topcoder community that not only allows them to expand their development skills, but also gives them access to projects where they can get paid for participating.