Spectrum - Browser-based app to visualize the frequencies of an audio file.
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android
Roomvine - Chatrooms for real life venues, neighborhoods and events
Forumotion.com - Create a free forum : free forum hosting, free forum skins, templates editing, chatbox, RPG mod... Choose PhpBB 2 - 3, Invision or PunBB. Create forums now!
Treadie - Create your own micro-social network for topics
Proboards - ProBoards is a host of free forums with customer service.