Jacob Driscoll did 2e conversions of the Complete Fighter's Handbook, Complete Thief's Handbook, and Complete Priest's Handbook as well as the Complete Wizard's Handbook and Complete Dwarf's Handbook. While I was not a fan of the latter two's original versions and, therefore, did not check out their conversions. I do think the conversions of the first three books are well done. I plan to use most of the quick builds converted from 2e kits when I run 5e (he saved me some work). I also liked what he did adapting 2e cleric spheres as sample priesthood variants of the 5e cleric domains for those taking the Acolyte background.2E - various race/class splatbooks and DM references
- 3E Manual of the Planes and Deities and Demigods: Lore, some mechanics, and some templates have proven useful to me.
I use my 3rd edition Forgotten Realms book.