Gobuntu is a official derivative of Ubuntu composed of only open source software. It was launched with the Ubuntu 7.10 release.
Gobuntu is a GNU/Linux operating system, derived from Ubuntu, that endeavors to adhere to the Free Software Foundations four freedoms and intends to provide a base for other free software platforms to build upon with minimal modification required.
Since the release of Gobuntu there has been not much said about it. So I downloaded the ISO and installed in VirtualBox to take a look.