Monstrosities     Swords & Wizardry original/official source
Tome Of Horrors Complete     Pathfinder original/official source
Fifth Edition Foes     D&D 5e original/official source
Tome Of Horrors 2018     D&D 5e original/official source
D&D 2e Monstrous Manual     D&D 2e (no source link)
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)