External Review References
Google Groups Reviews
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GroupSpaces - Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces
Eventbrite - Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Basecamp - A simple and elegant project management system.
Collaborizm - Meet New People. Build Amazing Things. A workspace for aspiring Entrepreneurs, Engineers, and Creatives.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Facebook Local - Discover places to go and events happening near you