Guestboard - Lead powerfully-organized group events with Guestboard – a modular event platform that gives groups of 10-1000+ people a central space to coordinate, build excitement, and save money. No more crazy email threads. No more massive group texts.
Coopz - Coopz: Dating app, Find friends & Meet new people app provides features through which users can discover like-minded people to hang out with.
Mobilizon - A free and federated tool to get our events off Facebook
Patook - Platonic Friend Making and Community App
Get Together - Get Together is an open source event manager for local communities.
Vistar - Vistar – Live Video Chat & Make Friends app allows users to enjoy video and voice chatting with their friends and family members right through their mobile phones.