Monstrosities     Swords & Wizardry original/official source
Pathfinder 1e Bestiary 1     Pathfinder original/official source
Pathfinder 2e Bestiary 1     Pathfinder original/official source
MojoBob (web)     D&D 2e original/official source
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)
Hacklopedia Of Beasts Vol 1     Hackmaster original/official source
Mystara Adversary Compendium I     Dragon Age original/official source
Adventures Dark And Deep     Adventures Dark And Deep (no source link)