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Angry Golem (web)     D&D 5e original/official source

OSE Encounter Activity Tables     Any original/official source

Pathfinder 1e Bestiary 1     Pathfinder original/official source

Pathfinder 1e Bestiary 2     Pathfinder 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

Creatures Of Vathis     D&D 5e original/official source

D&D 2e Monstrous Manual     D&D 2e original/official source

Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)

13th Age Bestiary     13th Age original/official source

Critters, Creatures, & Denizens     Dungeon Crawl Classics (no source link)

Monsters Compendium     Heroes Of Adventure (no source link)