Spectrum - Browser-based app to visualize the frequencies of an audio file.
Bubi Chat - Location based anonymous chatting app
Roomvine - Chatrooms for real life venues, neighborhoods and events
Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Treadie - Create your own micro-social network for topics
Omegle - Omegle is one of the most popular online chat website allowing user to communicate with anyone without registration.