Mobilizon - A free and federated tool to get our events off Facebook
Frill - A better way to collect customer feedback
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Roadmap - Collision avoidance for projects and people
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
Spaceli - Turn Google Docs into a knowledge base