RainEditor is a Flash authoring tool designed to make flash animation with particle system quick and easy, and optimized swf files will be exported ultimately.

Purposes hard to pursue for handwork, such as raining, snowing and falling leaves in the wind, now are easy to realize with the help of particle system.

Also you can export Flash swf files and they can be imported into Macromedia Flash and used as part of a larger Flash movie.

Complicated edit of action script is not necessary for RainEditor to realize those purposes. Further more, moving objects will be distributed to each frame computed according to time, so adding other flash elements is convenient, such as images and voices.