Mobilizon - A free and federated tool to get our events off Facebook

Nightly - One part dating, one part social, one part nightlife

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Atmospheir - Fastest way to discover, connect and chat with your contacts

DownToMeet - DownToMeet is a platform to organize, find, and attend group events.

Bad Numbers - A reverse telephone lookup of unwanted calls