Sesame Database Manager - Lantica Software, LLC - Sesame, A Q&A-compatible Database Manager.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Sheep - Membership and events for SMEs and nonprofits
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
DbFace - DbFace is an online database application & report building tool.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.