All I can think of are the ones from this site: http://hyboria.xoth.net/classes/index.htm
If you are interested, Signs & Portents issue #50 has a Healer and Gladiator class, and issue #30 had the Martial Disciple (basically a converted D&D Monk).
To my understanding, folks seem content with the core classes available from the rule book (they are seen as being generalized enough to cover anything you might find in a Conan yarn), without much interest with prestige classes, so there is not a lot of homebrew classes. The Temptress class was not originally part of Conan 1e books, but it's appearance in Hyborian's Fallen made it a hit enough to became core in 2e.
Personally, I would like to see a playable Merchant NPC-like class (basically like a literate Commoner, but with a better skills, and haggling abilities).