Pulse Particles

Rogue Development offers free ActionScript code or a Flash component to generate particle effects.

Pulse Particles is a general purpose AS3 particle system.

Features

• Configurable rule based particle behavior.
• Easily extensible
• Both a full featured object orientated syntax, and a simplified quick object syntax.
• Flash .mxp extension for easy integration for designers.
• Interactive particle explorer to create effects

You can even use this Flex application to preview the various effects you might want to generate.