shutdownd, a simple dead man's switch
shutdownc, a client for shutdownd

Warning: The following stuff is no longer actively maintained, so you'd better know what you're doing if you plan on using it. That said you can still mail me if you encounter bugs and I'll probably even fix them.

userneu, a Perl script to automate creating user accounts on FreeBSD and Linux
usermatic, a collection of small scripts to automate maintenance of user accounts by checking the passwd database against a list of current student/employees/whatever
usermatic-frontend, a simple commandline frontend to usermatic
sv-listparser, a Perl script that's probably only useful to Bavarian Schools. It converts lists exported from Bayrisches Schulverwaltungsprogramm to lists suitable for use with userneu/usermatic.
some other small scripts to faciliate various administrative tasks.