ToME: the Tales of Maj'Eyal

Not directly possessor related, but is there any documentation online about classes from tome3/2/1? Curious what old classes were like or how they changed coming into 4.

Classes were built from skills, which you can find spoilers there:
http://www.killerbunnies.org/angband/skill-230.html
http://www.killerbunnies.org/angband/spell-230.html
http://www.killerbunnies.org/angband/god-220.html

Thanks to the, yet again, amazing Zizzo !