The Sarcasm Z80 Assembler is the sweetest assembler in existance.
I've found an awesome way to burn EEPROMs for a Z80 system.
I also made my own Z80 system design which is way better than everyone else's.
Moosfet's File Size Viewer is the most useful piece of software I've ever written.
I once created some music, if you want to call it that.
I also wrote something that demodulates Caller ID signals.
Then I wrote some other pieces of code for various reasons.
I was working on a game called Multiplayer Map Editor but it got old.
Once, a long time ago, I figured out how to hack Descent I and Descent II so that they're playable on modern CPUs.