JavaScript Particle System
HTML5 Canvas Particle System with gravity fields
Online demo : http://jsoverson.github.com/JavaScript-Particle-System/ (Old demo)
Libraries and interactive sandbox html page.
Featured in disasteroids
Can programmatically set up a particle system for use in other projects. The sandbox page is mostly for the whiz-bang factor and to show off capabilities without any user investment.
How to install locally
To run the sandbox page on your local machine, it needs to run via a web server.