ownCloud gives you freedom and control over your own data.
A personal cloud which runs on your own server.

http://ownCloud.org

Installation instructions: http://owncloud.org/support

Source code: http://gitorious.org/owncloud
Mailing list: http://mail.kde.org/mailman/listinfo/owncloud
IRC channel: http://webchat.freenode.net/?channels=owncloud
Diaspora: https://joindiaspora.com/u/owncloud
Identi.ca: http://identi.ca/owncloud
