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.
“Oh my god, I've got to get into this!”
“Filter Forge does more than any of my other plugins all in one spot! I'm a kid in a candy store right now just having fun trying everything out. Fun, fun!”