Angry Golem (web)     D&D 5e original/official source
Pathfinder 1e Bestiary 1     Pathfinder (no source link)
Pathfinder 2e Bestiary 1     Pathfinder (no source link)
Hacklopedia Of Beasts     Hackmaster (no source link)
Critters, Creatures, & Denizens     Dungeon Crawl Classics (no source link)