Filter Forge is – by quite a margin – the most powerful plug-in we've looked at here. That's because it's a tool for creating plug-ins, both generative texture-creation tools and effect filters.
“I needed rock textures and instead of the usual day it takes me to make one, I was able to make 20! Again – applause to you all.”
“So often software will advertise one thing and not deliver. Your program not only delivers but does it with ease.”