LTSP - The Linux Terminal Server Project adds thin-client support to Linux servers.
ENDALGO - Team and league management for the social athlete
Thinstation - Thinstation is a basic and small, yet very powerful, open source thin client operating system...
Sports Bridge - Find a sports team for your child
linuxmuster.net - linuxmuster.net is a comprehensive complete solution for the operation of school IT infrastructure.
Athlete Builder - Get better at your sport (mostly football right now)