I've been programming since I got my hands on a TI-83 in precalculus class during junior year of high school. Some cool stuff I've done:

• Chord-o-matic Chord Player: find out what those crazy chords are named!
• Everytime: keep track of the current time in lots of time zones from your system tray
• BigFraction: open source Java library for handling fractions to arbitrary precision.
• JSON Formatter: a completely client-side JSON beautifier/uglifier.
• QuickReplace: a completely client-side regex tool. It's behind some ugly developer UI since I created it for myself to use. (Sorry not sorry.)