ownCloud is a personal cloud which runs on your own server.
It is alpha software in development and should be treated accordingly.

http://owncloud.org

Installation instructions: http://owncloud.org/index.php/Installation
Source code: http://projects.kde.org/owncloud

Mailing list: https://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