ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.
Orbit.love - Grow and measure your community across any platform with Orbit, the community experience platform. Try Orbit for free!
Proboards - ProBoards is a host of free forums with customer service.
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
GraphJS - Make any website social