TeamSnap - Sports Team, Club & League Management Software & Apps
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Spond - The easiest way to organize team sports or other type of group activities
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Heja - Easily communicate within your sports team
Membee - Membee is web-based membership management software.