Openki - Platform where you can search, propose, take part, help organize or publish workshops, lectures...

Guestboard - Lead powerfully-organized group events with Guestboard – a modular event platform that gives groups of 10-1000+ people a central space to coordinate, build excitement, and save money. No more crazy email threads. No more massive group texts.

Citybound - Open-source city building sim with a focus on realism through microscopic details

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

SimCity BuildIt - Build, craft, and control! SimCity BuildIt is an all-new SimCity game designed just for mobile.

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