These are a few of the things that I've worked on in my spare time. I wish that I had kept half of what I've worked on.

File Locker
FileDescription
alternatecssselector.user.js A user script for Chrome, Firefox, or Opera that exposes different CSS style options that the page author may have made available
compatmode.user.js A user script for Chrome, Firefox, or Opera that shows the rendering mode the browser used for the page