The Monsters & Creatures Compendium     Any (no source link)
The Monsters Know What They're Doing     Dungeons And Dragons original/official source
Monstrosities     Swords & Wizardry original/official source
Angry Golem (web)     D&D 5e original/official source
Pathfinder 1e Bestiary 1     Pathfinder original/official source
Pathfinder 2e Bestiary 1     Pathfinder original/official source
Giants Revisited     Pathfinder original/official source
Monster Manual     D&D 5e original/official source
Volo's Guide To Monsters     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)
Hacklopedia Of Beasts Vol 3     Hackmaster original/official source
Lairs And Encounters     Adventurer, Conqueror, King (no source link)