Ubuntu with Gnome .. the mother (grandmother Debian)
Ebuntu with Enlightenment
Edubuntu for education
Scibuntu for science
Devubuntu for developers
nUbuntu for testing servers and networks
Dubuntu in chinese
zUbuntu for IBM eServer zSeries mainframes
Ubuntu Satanic Edition vs. Ubuntu Christian Edition
related: gNewSense, X-Evian, ImpiLinux, mEDUXa, EduPuppy GioveLUG, MoLinux, Arabian Linux, Guadalinex, Linux Mint