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 do think you guys are likely the best software company I've ever had dealings with.”
“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.”