The Monsters & Creatures Compendium     Any (no source link)
Dracopedia Bestiary: An Artist's Guide     Any original/official source
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
Atlas Animalia     Any original/official source
OSE Encounter Activity Tables     Any original/official source
Pathfinder 1e Bestiary 1     Pathfinder original/official source
Pathfinder 2e Bestiary 1     Pathfinder original/official source
Pathfinder 2e Bestiary 2     Pathfinder (no source link)
Mythic Monster Manual v1     Pathfinder original/official source
Exotic Encounters     Pathfinder original/official source
Monster Manual     D&D 5e original/official source
Monster Monday (web)     D&D 5e original/official source
Monster Ecology Anthology     D&D 5e (no source link)
Monster Manual     D&D 4e (no source link)
D&D 2e Monstrous Manual     D&D 2e (no source link)
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)
AD&D Monster Manual     AD&D 1e (no source link)
Dragonlance Bestiary     SAGA (no source link)
Critters, Creatures, & Denizens     Dungeon Crawl Classics (no source link)
Monsters Compendium     Heroes Of Adventure (no source link)
Harnmaster Gold Bestiary     Harnmaster original/official source
Iron Falcon Handbook Of Monsters     OSR (no source link)
Adventures Dark And Deep     Adventures Dark And Deep (no source link)
Lairs And Encounters     Adventurer, Conqueror, King (no source link)
Baby Bestiary 2     Any original/official source