Organic groups

Enable users to create and manage their own 'groups'. Each group can have subscribers, and maintains a group home page where subscribers communicate amongst themselves. They do so by posting the usual node types: blog, story, page, etc. A block is shown on the group home page which facilitates these posts. The block also provides summary information about the group.

Groups may be selective or not. Selective groups require approval in order to become a member, or even invitation -only groups. There are lots of preferences to configure groups as you need.

Groups get their own theme, language, taxonomy, and so on. Integrates well and depends upon Views module

Developers - this module exercises the node access API thoroughly. You may want to study it for guidance.

Demo sites: http://groups.drupal.org, http://teamsugar.com/group/620221, http://www.mailfriends.com/og, http://www.mothersclick.com/groups

Drupal6: OG port has begun. I expect a release 1 week after Views releases.

Releases

Official releases	Date	Size	Links	Status
5.x-7.2	2008-May-12	165.58 KB	Download · Release notes	Recommended for 5.x
5.x-6.1	2008-Apr-11	159.13 KB	Download · Release notes	Supported for 5.x