HeySpace - HeySpace is the only free task and simple project management software with communication and collaboration feature.
Mobilizon - A free and federated tool to get our events off Facebook
The New Dropbox - Enterprise software portal for team collaboration
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Flow - Stop managing projects from your inbox.
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.