GroupSpaces

Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces

Astraweb

Premium Unlimited Usenet news server services.

Attendize is a free & open-source ticket selling and event management platform

Scalable global events community around your brand

Confetti is the all-in-one tool for all your conferences, festivals, workshops and social events.

DownToMeet is a platform to organize, find, and attend group events.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Far or Near™ is a privacy-oriented social network that helps you connect with others who share your…

Create email discussion lists

Mailman is free software for managing electronic mail discussion and e-newsletter lists.

Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Used by thousands of sports groups around the globe, OpenSports is the gold standard for managing events, attendees, and payments.

The Groups Place is a new alternative to Meetup.

Wiggio is an online toolkit that makes it easy to work in groups. With Wiggio you can:

Online discussion boards from Yahoo!

A great alternative to Google and Yahoo groups.