Small utilities I've built (mostly for myself):
- /tz - Local times of common time zones.
- /ip - IP lookup.
- /doy - Ordinal date to YYYY-MM-DD converter.
- /timer - A simple timer and countdown.
- /mc - Morse code encoder/decoder.
- /cc - Caesar cipher encoder/decoder.
Games
- /mh - Monty Hall problem simulator.
- /a2z - How fast can you type the alphabet/days of week/months of year?
Fun
- /on - The most efficient way to check whether or not your computer is on.
- /onfire - Four! I mean five! I mean fire!