Upcoming.org - A simple way to share and discover interesting events
Spond - The easiest way to organize team sports or other type of group activities
Mobilizon - A free and federated tool to get our events off Facebook
TeamSnap - Sports Team, Club & League Management Software & Apps
Openki - Platform where you can search, propose, take part, help organize or publish workshops, lectures...
Fullcourt - The social network for basketball players