It's a pretty simple particle engine, with a few different options.
Particles are static (well, they rotated and scale, but they don't have any
advanced movement) unless you move them yourself. It renders at 400x300
fairly quick, but once you get to 640x480 it slows to a crawl. It features:
6 different types of filters (4 shown here)
Most filters can be "Jittered" (see first shot) which makes them sparkle
quite a bit, for a firework effect.
"Alpha Mask" mode, which allows you to (although cumbersomely) export
AlphaMask animations, which could be used for animated blended textures.
Runs in OpenPTC so it should be portable if I ever want to make a mac