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).
Urbanesia, the leading Indonesian lifestyle directory website, announced the launch of an open API. The open API enables third-party developers to incorporate Urbanesia's location data into third-party apps. The API allows developers to retrieve location data generally or in categories (e.g. restaurants, tourist spots, etc.). Selina Limman, Urbanesia CEO, commented: "We hope Urbanesia’s API can increase the developers’ creativity as they can [now] focus more on application development rather than data collection."
n0tice is a simple location based public notice board system. It's completely open and unfiltered, and allows users to post any sort of notice they want, tagged with their location, and lets them read notices near them, sorted by distance. Quite a simple little idea, and if it gets a user base, it could end up being quite useful. Although first designed for iPhone, the n0tice API was quickly released to allow integration into other programs, including desktop apps.