Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
TeamSnap - Sports Team, Club & League Management Software & Apps
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Spond - The easiest way to organize team sports or other type of group activities
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.
Heja - Easily communicate within your sports team