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.
One of the primary reasons that organizations embrace agile development methodologies is on the assumption that faster application development will result in more applications being developed faster. The challenge is actually managing that process in a world where the number of languages and data sources being used is rapidly expanding.
Metwit is a crowdsourced API platform that provides third party applications the ability to integrate media-rich local weather and environmental data that is hyperlocal and in real-time. The Metwit API Platform collects weather information from Twitter, Instagram, NOAA and other sources which makes it possible for third party applications to use tweets, photos, and metatags to provide users accurate and interactive local weather information.