Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Mobilizon - A free and federated tool to get our events off Facebook
Patook - Platonic Friend Making and Community App
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
eventup - Find Great Event Venues in the US
Let's Try Sports! - Let's Try Sports is a website for finding sports activities in your local area: tennis...