Roomvine - Chatrooms for real life venues, neighborhoods and events
Hoodline - Hyper-local SF news from the former editor of TechCrunch
Spectrum - Browser-based app to visualize the frequencies of an audio file.
CO Everywhere - Hyper-local news for every neighborhood in the world
CityBugs - Improving cities to make them a better place to live in.
The Tab - Hyperlocal news site written by student journalists