d20/OGL
These products are designed for the 3.x generation of the d20 rules. They are NOT built for the Pathfinder Roleplaying Game but should be pretty easy to use in a Pathfinder game.
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3rd Edition
3rd Edition/3e
adventure
Adventure (Low-Level)
Adventure Path
Arcanist
Archetypes
armor
bestiary
campaign setting
Cards
Class Options
classes
collectible
Core Rules
d20
d20/OGL
diseases
equipment
fantasy
feats
gm tools
Horror
Jewelry
magic
magic items
Maps/Battlemaps
Modern
monsters
Monsters/Enemies
OGL
Old School/OSR
OOP
Player Aids
Player Options
Poisons
Prestige Classes
Psionics
Races
sci-fi
space
Spells
tarot
Traits
treasure
True20
weapons