Elgg: a powerful social engine.

Elgg empowers individuals, groups and institutions to create their own fully-featured social environment.

We gave it a test drive and it gets two thumbs up! Aside from being easy to install and setup on a basic Linux web server, this "powerful social engine" is packed with all the features you need and expect in a social network.

You can try the demo before you download it or visit the site to learn more about the project.