Small utilities I've built (mostly for myself):
Date/Time utils
- deathcrush - Visualize your life.
- unix-to-utc - Unix timestamp to UTC converter.
- tz - Local times of common time zones.
- doy - Ordinal date to YYYY-MM-DD converter.
- timer - A simple timer and countdown.
Cryptography
Misc
- ip - IP lookup.
- unix-perms - Unix file system permissions visualizer.
Cellular automata
- life - Conway's Game of Life simulator.
Games
- mh - Monty Hall problem simulator.
- a2z - How fast can you type the alphabet?
Fun
- on - The most efficient way to check whether or not your computer is on.
- onfire - Four! I mean five! I mean fire!