zem.fi / gehennom.org / befunge.org
existing content, in no particular order:
-
SSH-knock-nano-HOWTO - instructions
on how to make a port knocking
thing out of iptables chains. bears a striking resemblance to
other similar solutions. there's a Windows client app to use
with PuTTY.
-
ttd_logic - silly logic gate simulation
experiment with OpenTTD.