3rd Party Prestige Classes for Greyhawk Campaign (& Forgotten Realms) & other notes

Seuloise Empire-Mesopotamia, Greek poli, Roman Republic & Empire
Charioteer (Base Class) (Chessenta)
Gladiator (Base Class)
Magus of the Starry Host
Master Charioteer
Orator (Chessenta)
Pankretiast
Royal Astrologer
Runner (Chessenta)
Soothsayer
Vigil

Baklun (Zakhara)-Persia, nomadic Arabs
Alchemist
Bedoul
Charioteer
Desert Hermit
Ghazi
Master Charioteer
Vizir of the Four

Oeridian-feudal Germanic system (England, France, Germany, etc.)

Flan-Celtic & Germanic tribes, some Native American
Charioteer
Fianna Eirinn (Flan)
Gaestate
Master Charioteer
Raider
Wild Woman

Celestial Imperium (Shou Lung, Tu Lung)-Imperial China
Alchemist
Dim Mak Practitioner
Diviner
Geometer
Iron Hand Disciple
Sword Saint

Olman-Central America (Aztec, Maya)
Eagle Knight
Jaguar Knight

Flan Bard-Knowledge (history, nature), Perform (oratory, string); Animal Affinity, Weapon Focus (short sword)
Flan Warrior-Intimidation; dagger, short sword, longspear, javelin, sling, longsword, short spear; padded armor, ring mail, wooden shield

Farsi-(Baklunish, Zakharan) Paladin-khanjar (dagger), sword, bow & dagger, handaxe, light hammer, tabarzin (battleaxe), lance (spear), javelin; Improved Grapple