Phonk

West of Loathing and Shadows Over Loathing might fit the bill here. The heavy amounts of surrealist humor are definitely not for everyone though.

Common moss w

I’ve mostly been running the Without Number systems by Sine Nomine (Stars/Worlds/Cities Without Number). They’re rules light ENOUGH that things don’t bog down in combat, but still allow a extreme degree of player freedom in character creation. Coupled with the GM tools, it’s pretty much the only system I need.