A list of Distributions in the educational field (You can also use the "Education" filter on distrowatch.com to see which distro is under active developement):
Debian Edu Re-integration of Skolelinux in Debian.
eyeos for schools platform independent school server (AGPL3)
freeduc (French, based on Knoppix)
JUXlala Linux in kids- and youth work. >3years
kmLinux (de) Schleswig-Holstein .
Linux-EduCD (Polish, based on Mandriva)
OpenSchoolServer (with support)
paedML Linux Standard solution for Bavaria and Baden-Württemberg.
Pinguino (de) The OS for kits from 6 to 10 years.
Qimo is a desktop operating system designed for kids. Based on Ubuntu
slixs development aktive, Forum inaktive?