I'm an old fan of classic Gamma World, and a fan of the newer Mutant Future game. I even did the artwork for Mutant Future (my first commissioned work). I stated this Wiki to get the fans to consolidate their home-brewed materials. I'm the sort of GW fan that like my game to be wacky as hell, and still be as grim as a H.P. Lovecraft story.
My source of inspirational GW/MF material: Thundarr the Barbarian, Kamandi: The Last boy on Earth, The Colours Out of Space, A Princess of Mars, Gandahar (Light Years in the US), La Planète Sauvage (Fantastic Planet in the US), Axa (a comicbook from the UK), Heavy Metal the Movie (mostly the Den and Taarna segments), and The Savage Land from Marvel comics.
The other games I enjoy: HeroQuest (the best boardgame ever!), OD&D Supplement V: Carcosa, Barbarians of Lemuria, Conan RPG, Battletech, (any mecha-themed war-fiction with the Silhouette system), (D&D with the Basic Fantasy ruleset), Divine Right, Star Frontiers, Necromunda, Mordheim, Go, Jetan, and Street Fighter: The Storytelling Game of all things.