Here are some links to a few mini-projects I've tinkered with in the past. Beware, these are all in various states of disrepair:

Mandelbrot Set Generator
This was a pretty cool thing I built in 2009 or so. It is not exactly optimal, but it does the job!

Not Asteroids!: An HTML5 game
This was a hoot to create, and gave me a lot of respect for "real" HTML5 games. I would like to re-visit this stuff in the future.

Online STL File Reader/Viewer
An experiment with THREE.js and binary file reading in JS, This can read and view (some) STL files.

NetSpice: Online Circuit Simulator
This allows me to hearken back to my hey-day of text-based SPICE. It...sort of works.