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Here's the first public release of GeoMata (my ADC I entry). The concept is very simple, we provide an open REST service that maps geographic locations to web content (audio, video, html), and a mobile client for accessing this data.

The GeoMata android client displays these "blips" either on a map or in list form, sorted by proximity to your current location. A typical usage scenario might go something like this: You're standing next to a monument of some historic person. You launch GeoMata on your mobile device, GeoMata uses the devices GPS to query our service, and then gives you a list of available web content, perhaps a wikipedia page pertaining to the person or monument your looking at.