External Review References
Google Groups Reviews
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Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Basecamp - A simple and elegant project management system.
Eventbrite - Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Bevy - Scalable global events community around your brand
Gaggle Mail - Gaggle Mail is a simple and easy to use email list manager.