Flexible (and free) Particlesystem to be tweaked?

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Ok, I did write this question in Beginners section but I started to realize that I might soon be able to "climb the ladder" to you guys :P s here it goes again:

I'm in a big need of a flexible particlesystem that I freely can tweak and add some features on (I will expand it into a full FX-editor).
So my question is which one I should use that's available and free. I would love some different voices here and best would of course be if you have tried more than one so you actually have something to compare it with...

I still don't to reveal all the ideas around this FX-editor but IF I could get my hands on an already created particlesystem which I could alter/update and tweak and then publish freely without having to pay anything (or going trough a lot of legal things) I will of course publish it freely for you all.

regards and thanks for help