TeamSnap - Sports Team, Club & League Management Software & Apps
Mobilizon - A free and federated tool to get our events off Facebook
Team App - Team App is a platform that allows teams and groups to improve communication by creating their very own smartphone app.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Jersey Watch - Jersey Watch is sports management software specially designed for the teams and leagues for organizing players, managing payments, and effective communication.
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.