A free (libre), open-source (GNU GPL), content management platform designed for group collaboration. Open Atrium is based on Drupal (running on Apache, with a MySQL database).
e107 is a content management system written in PHP and using the popular open source MySQL database system for content storage. It's completely free, totally customisable and in constant development.
Want to build your own community? Now you're limited only by your imagination. Not by software. Dolphin Smart Community Builder is a universal, open source software solution that allows you to build any kind of online community. With a huge variety of fea