Galette - Galette is a membership management web application towards non profit organizations.
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
WildApricot - WildApricot is a powerful cloud software to help you automate and simplify membership tasks.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Tendenci - Tendenci - The Open Source AMS is a cloud-based all-in-one management SaaS solution for Non-profits and Associations.
NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.