While searching the web, I came across a site that had excellent particle effects.
It was wondertouch. The site sells premade effects, as well as a program for making effects. The explosions were very good, and the other effects seemed decent too. The program is called particleIllusion3.0 and it allows you to make countless different effects. However, it will set you back almost $400. It does come preloaded with 1500 effects included. So if you’re willing to dish out the cash, then this is the progam to go with.
A free alternative is flint, which uses actionscript to generate the effects. The effects that can be made with it aren’t as good, but it’s free.