Monsters by rulebook

Rulebook name Edition
The Forge of War Eberron (3.5)
The Shattered Gates of Slaughtergarde Supplementals (3.5)
Tome and Blood: A Guidebook to Wizards and Sorcerers Supplementals (3.0)
Tome of Battle: The Book of Nine Swords Supplementals (3.5)
Tome of Magic Supplementals (3.5)
Unapproachable East Forgotten Realms (3.0)
Underdark Forgotten Realms (3.5)
Unearthed Arcana Supplementals (3.5)
Weapons of Legacy Supplementals (3.5)
Web Core (3.5)