Trick question? Some film developer?
But really I use a darkbag, a tank and reels, some developer, water as stop and fixer and then photoflo, which is probably what 99% of people use. I've used xtol and d76 for developers. Xtol is nice but it's a pain to mix because you have to make it in 5 liter quantities, whereas d76 can be had in 1 liter packages. I'm gonna try some type of liquid concentrate and doing color soon.
My photos --> http://flickr.com/photos/nfavate/
University of Delaware