Mistrealm
Option Books
TSR came out with several sourcebooks designed to be optional changes to the system.
2149 Player's Option: Combat & Tactics, 1995
2154 Player's Option: Skills & Powers, 1995
2156 Dungeon Master Option: High-Level Campaigns, 1995
2163 Player's Option: Spells & Magic, 1996
11383 AD&D Campaign Option: Council of Wyrms, 1999
What do you think?