It's a next generation learning content management system focusing on ease of use, re-usibality, collaboration and sharing. See documentation/index.html for a complete overview of Chamilo.
You need a working web server + PHP + MySQL setup. Refer to documentation/installation_guide.html for instructions.
Please submit any bugs, feature requests and non-trivial patches to http://support.chamilo.org/
For news, events and more information on Chamilo LMS please visit http://www.chamilo.org/
Check out #chamilo on irc.freenode.net.
Visit the official Chamilo Forum: http://www.chamilo.org/forum
Chamilo is licensed under the GPLv3 license.