LTSP - The Linux Terminal Server Project adds thin-client support to Linux servers.
OurPact - Parental Control for apps and devices
Thinstation - Thinstation is a basic and small, yet very powerful, open source thin client operating system...
Kidslox - Set boundaries for your kids
linuxmuster.net - linuxmuster.net is a comprehensive complete solution for the operation of school IT infrastructure.
Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.