Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
Gaggle Mail - Gaggle Mail is a simple and easy to use email list manager.
Membee - Membee is web-based membership management software.
Admidio - Admidio is a free online membership management, which is optimized for associations, groups and organizations.