Kanegrundar
Explorer
I have to suggest:
Settings: Iron Kingdoms (Character and World Guides), Arcana Evolved, Eberron, and Warcraft
Generic 3E books: Complete line, Unearthed Arcana
Modern/Sci-Fi: D20 Future, Star Wars Ultimate Alien Anthology, Star Wars Revised Core Rules, Star Wars Hero's Guide, anything from Ronin Arts (pdfs) and RPGObjects (especially Darwin's World 2, Blood and Brains, and Blood and Relics 2)
Supers: Mutants and Masterminds, Crooks!, Foes of Freedom, and Freedom City
Non-D20: Warhammer Fantasy Roleplay v2, Old World Bestiary, Savage Worlds
Kane
Settings: Iron Kingdoms (Character and World Guides), Arcana Evolved, Eberron, and Warcraft
Generic 3E books: Complete line, Unearthed Arcana
Modern/Sci-Fi: D20 Future, Star Wars Ultimate Alien Anthology, Star Wars Revised Core Rules, Star Wars Hero's Guide, anything from Ronin Arts (pdfs) and RPGObjects (especially Darwin's World 2, Blood and Brains, and Blood and Relics 2)
Supers: Mutants and Masterminds, Crooks!, Foes of Freedom, and Freedom City
Non-D20: Warhammer Fantasy Roleplay v2, Old World Bestiary, Savage Worlds
Kane