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

Bumble - Bumble is a social network that allows you to feel empowered while you make those connections, whether you’re dating, looking for friends, or growing your professional network. One first move on Bumble could change your life.

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

Tinder - Tinder is how people meet. It's like real life, but better.

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

Hinge - Find people you want to date through your friends on Facebook.