As opposed as I generally am to the idea of PrCs in Conan, here are some decent ones (most completely non-magical), though some will need to be tweaked for the setting:
SEDUCERS
Beguiler (Pale Designs: A Poisoner's Handbook by Bastion Press)
Lothario (Ultimate Prestige Classes #2, Quintessential Human)
This is a seducer/corrupter/poisoner for male or female characters similar to my Femme Fatale core class I made for Conan, though I forgot to consult them when I made mine up, LOL.
BODYGUARDS
Bodyguard (Dynasties & Demagogues by Atlas Games)
This PrC gets observation abilities and special abilities to defend his charge similar to the Devoted Defender of Sword & Fist. Conan examples of this class are numerous (Bombaata from Conan The Destroyer springs to mind).
BOUNTY HUNTERS
Bondsman (Pale Designs: A Poisoner's Handbook by Bastion Press)
This is a bounty hunter.
PIRATES
Brethren (Pirates! by Living Imagination, Inc.)
Gentleman Pirate (Pirates! by Living Imagination, Inc.)
Marauder (Pirates! by Living Imagination, Inc.)
Pirate (Pirates! by Living Imagination, Inc.)
Reckless Boarder (Pirates! by Living Imagination, Inc.)
Sail Rider (Pirates! by Living Imagination, Inc.)
Lots of pirates in Conan! ARRR! AVAST THERE, ME HEARTY!
BARBARIANS
Chieftain (Dynasties & Demagogues by Atlas Games)
Good for barbarians. Plenty of chieftains in Conan.
NOBLES/SOLDIERS
Commander (Noble's Handbook by Green Ronin)
Lord Knight (Noble's Handbook by Green Ronin)
This is a civilized military commander or knight for battlefield use. Plenty of examples of these guys in Conan.
CULTISTS & CONSPIRATORS
Conspiracy Leader (Dynasties & Demagogues by Atlas Games)
Cult Leader (Campaign Magazine #2 by Fast Forward Entertainment)
Cult Leader (Alt.) (Ultimate Prestige Classes #2, Quintessential Human)
Demagogue (Dynasties & Demagogues by Atlas Games)
Impersonator (Noble's Handbook by Green Ronin)
Infiltrator (Pale Designs: A Poisoner's Handbook by Bastion Press)
Mastermind (Noble's Handbook by Green Ronin)
Religious Leader (Dynasties & Demagogues by Atlas Games)
These are all variants of the same idea and are well documented in Conan: Thulsa Doom from the CtB movie, Jhandar from Conan The Unconquered, etc. The demagogue is more of a political idealogue bent on establishing a Cult of Personality, like Hitler, Stalin or Napoleon. These PrCs use dogma (religious or political) to gather riches, followers and power. The conspiracy leader/mastermind creates sleeper cells (like Thulsa Doom in CtB), while the IOmpersonator/Infiltrator carries out their evil schemes, assassinating and replacing targets or posing as legitimate members of rival organizations. The Campaign Mag Cult Leader is a Cthulhu-esque high priest type; the Mongoose version is more of a con-man with no real faith of his own (see Conan The Rogue for an example). The Mongoose version is problematic in that it has D&D cleric powers at higher levels that would need to be stripped out for Conan.
DIPLOMATS
Diplomat (Dynasties & Demagogues by Atlas Games)
Diplomat (Noble's Handbook by Green Ronin)
Politician (Dynasties & Demagogues by Atlas Games)
All civilized nations have these guys.
SCHOLARS
Information Mage (Dynasties & Demagogues by Atlas Games)
A sorcerer specializing in Divination to aid himself or a ruler; items he makes he can use to track the bearer.
Jali ("Witchdoctor") (Pirates! by Living Imagination, Inc.)
Savage, voodoo shaman good for Black Kingdoms to differentiate their magic.
ASSASSINS
Nightstalker (Pale Designs: A Poisoner's Handbook by Bastion Press)
Sniper (Pale Designs: A Poisoner's Handbook by Bastion Press)
SLAVERS
Slaver (Pirates! by Living Imagination, Inc.)
NPC only classes (Level 1-5 mini core classes):
Canthartisan (Alchemist) (Pale Designs: A Poisoner's Handbook by Bastion Press)
Henchman (Pale Designs: A Poisoner's Handbook by Bastion Press)
Fading Suns d20 has some nice alternate core classes, too, such as a non-magical Priest (if one was dissatisfied with Conan's version).
SEDUCERS
Beguiler (Pale Designs: A Poisoner's Handbook by Bastion Press)
Lothario (Ultimate Prestige Classes #2, Quintessential Human)
This is a seducer/corrupter/poisoner for male or female characters similar to my Femme Fatale core class I made for Conan, though I forgot to consult them when I made mine up, LOL.
BODYGUARDS
Bodyguard (Dynasties & Demagogues by Atlas Games)
This PrC gets observation abilities and special abilities to defend his charge similar to the Devoted Defender of Sword & Fist. Conan examples of this class are numerous (Bombaata from Conan The Destroyer springs to mind).
BOUNTY HUNTERS
Bondsman (Pale Designs: A Poisoner's Handbook by Bastion Press)
This is a bounty hunter.
PIRATES
Brethren (Pirates! by Living Imagination, Inc.)
Gentleman Pirate (Pirates! by Living Imagination, Inc.)
Marauder (Pirates! by Living Imagination, Inc.)
Pirate (Pirates! by Living Imagination, Inc.)
Reckless Boarder (Pirates! by Living Imagination, Inc.)
Sail Rider (Pirates! by Living Imagination, Inc.)
Lots of pirates in Conan! ARRR! AVAST THERE, ME HEARTY!
BARBARIANS
Chieftain (Dynasties & Demagogues by Atlas Games)
Good for barbarians. Plenty of chieftains in Conan.
NOBLES/SOLDIERS
Commander (Noble's Handbook by Green Ronin)
Lord Knight (Noble's Handbook by Green Ronin)
This is a civilized military commander or knight for battlefield use. Plenty of examples of these guys in Conan.
CULTISTS & CONSPIRATORS
Conspiracy Leader (Dynasties & Demagogues by Atlas Games)
Cult Leader (Campaign Magazine #2 by Fast Forward Entertainment)
Cult Leader (Alt.) (Ultimate Prestige Classes #2, Quintessential Human)
Demagogue (Dynasties & Demagogues by Atlas Games)
Impersonator (Noble's Handbook by Green Ronin)
Infiltrator (Pale Designs: A Poisoner's Handbook by Bastion Press)
Mastermind (Noble's Handbook by Green Ronin)
Religious Leader (Dynasties & Demagogues by Atlas Games)
These are all variants of the same idea and are well documented in Conan: Thulsa Doom from the CtB movie, Jhandar from Conan The Unconquered, etc. The demagogue is more of a political idealogue bent on establishing a Cult of Personality, like Hitler, Stalin or Napoleon. These PrCs use dogma (religious or political) to gather riches, followers and power. The conspiracy leader/mastermind creates sleeper cells (like Thulsa Doom in CtB), while the IOmpersonator/Infiltrator carries out their evil schemes, assassinating and replacing targets or posing as legitimate members of rival organizations. The Campaign Mag Cult Leader is a Cthulhu-esque high priest type; the Mongoose version is more of a con-man with no real faith of his own (see Conan The Rogue for an example). The Mongoose version is problematic in that it has D&D cleric powers at higher levels that would need to be stripped out for Conan.
DIPLOMATS
Diplomat (Dynasties & Demagogues by Atlas Games)
Diplomat (Noble's Handbook by Green Ronin)
Politician (Dynasties & Demagogues by Atlas Games)
All civilized nations have these guys.
SCHOLARS
Information Mage (Dynasties & Demagogues by Atlas Games)
A sorcerer specializing in Divination to aid himself or a ruler; items he makes he can use to track the bearer.
Jali ("Witchdoctor") (Pirates! by Living Imagination, Inc.)
Savage, voodoo shaman good for Black Kingdoms to differentiate their magic.
ASSASSINS
Nightstalker (Pale Designs: A Poisoner's Handbook by Bastion Press)
Sniper (Pale Designs: A Poisoner's Handbook by Bastion Press)
SLAVERS
Slaver (Pirates! by Living Imagination, Inc.)
NPC only classes (Level 1-5 mini core classes):
Canthartisan (Alchemist) (Pale Designs: A Poisoner's Handbook by Bastion Press)
Henchman (Pale Designs: A Poisoner's Handbook by Bastion Press)
Fading Suns d20 has some nice alternate core classes, too, such as a non-magical Priest (if one was dissatisfied with Conan's version).