Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Roomvine - Chatrooms for real life venues, neighborhoods and events
Bubi Chat - Location based anonymous chatting app
Spectrum - Browser-based app to visualize the frequencies of an audio file.
Roundio - Explore what people posted to Instagram or Flickr near you
CityBugs - Improving cities to make them a better place to live in.