OGo on Redhat - Unofficial RedHat install HOWTO. - http://sukka.jct.ac.il/~yedidia/ogo_rh.html
OGo on Debian - Unofficial Debian install HOWTO. - http://helms-deep.cable.nu/~rwh/howtos/OpenGroupware-Debian-HOWTO.html
OpenGroupware.org - Project background, mission, license and download page. Including some screenshots, FAQ and documentation. - http://www.opengroupware.org/