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
Critter Cache: Animals And Beasts D&D 4e original/official source
Critters, Creatures, & Denizens Dungeon Crawl Classics (no source link)
Animal Archive d20 (no source link)