InstagramKit is an Objective C wrapper for the API. It aims to interact with Instagram's model objects using blocks-based architecture and asynchronous JSON response. Cocoapods is required to install. If this is the first time developers create an app, they need to register in Instagram's client site. A demo project exists to discover how the engine can be used. InstagramKit is not supported by Instagram or Facebook. For more info, contact Shyam Bhat @bhatthead
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.
Ocutag, a division of Ricoh Innovations, aims to help apps deliver content to users taking photos. Their aim is to herald a new model of retail. App designers upload images and tag them with information. When users snap pics of the same thing in reality, information can be delivered through the app, such as that appearing in the graphic of the scarf below: where to buy it, details about it, local stores that carry it. What information is delivered is up to the company with the app. The company provides the Ocutag API for integration.