I came accross a download I'd like to share with those who love frax flames but are enslaved to kpt.Its a stand alone program(no filter) and you have more control over the end product.it is freeware and there are presets available by others on the net.
"The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts." Bertrand Russell
I've been working with apophysis for quite some time. You can see in my gallery if you like. If you have any questions, feel free to ask by Personal Message. I'm not the best, but I know pretty much everything about Apophysis except how exactly to program with it.
"The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts." Bertrand Russell
see here for a list of open source softwares. I'd check the GNU softwares as well. You may be able to find some helpful stuff there... I'm sure any open source developers would love a coder willing to help debug for mac.
if I remember correctly Blender had a major bug affecting Mac with the release that was two releases prior...the next one they said they fixed the compatability problem. I don't use Mac though, so I can't tell you for sure or not if they have.
http://www.apophysis.org/
blessings