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Groupspaces has ability to manage multiple groups, mailing list, member management, wiki, file management and event management for groups.

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Google Groups + Google Docs – zhongshu Aug 23 '10 at 1:38
This don't do member management – CharlesB May 4 '12 at 15:48
Bounty requester here: while there are plenty of collab or facebook-like webapps, I can't find any open-source app specifically for membership, like the one you'd want to run when ruling a club – CharlesB May 9 '12 at 5:47

You can use a free open source tool like http://dotproject.net

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I really like so much of TeamBox, with some adapt you can get all this things. And the code is available on GitHub.

Teambox source code

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Thanks, but it's more a collaboration tool than a membership (member coordinates, and list management) tool – CharlesB May 9 '12 at 5:44
Yeah, I agree. Analyzing better those core functions, we have a local server running our Teambox fork, so we had to develop all those "integrations". I will try to commit this project at GitHub. – danielnegri May 11 '12 at 20:53


Collaborative Applications 
Social Applications 
Productivity and Interfaces 
Organization and Management 
Search, Navigation and Retrieval 
Customize and Extend 
Technology Platform


I know it's not open source, but It seems to fit your requirements. Features listed, are -

Member Management
Shared Admin Access
Payment Processing
Group Communication
Calendar and Event RSVP
Photo and File Sharing
Reviews and Classifieds
Public Group Page
Private and Secure

Few more options are listed there at Wikipedia.

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both are nice, especially cyn.in but no mailing list management... – CharlesB May 11 '12 at 9:37
You could mix cyn.in and phplist. And I'm pretty sure, there'd be a way to implement mailing list in cynin. They just didn't mention it like that. – Bibhas May 11 '12 at 10:45

Have a look at BuddyPress


Social networking in a box. Build a social network for your company, school, sports team or niche community all based on the power and flexibility of WordPress.

BuddyPress is completely free and open source. Unlike hosted services, BuddyPress allows you to stay in control of your site and create a totally customized, unique experience

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I think OpenCore or CrabGrass should cover all your needs.

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It looks like GroupServer might do what I want, it is a mailing list manager with online administration of members and lists.

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