Pathfinder 1e Bestiary 2 Pathfinder original/official source
Pathfinder 2e Bestiary 3 Pathfinder original/official source
Mythic Monster Manual v2 Pathfinder original/official source
All Sorts Of Critters (web) Pathfinder original/official source
Kobold Press Creature Codex D&D 5e original/official source
Mythos Monsters D&D 5e original/official source
Alien Archive Starfinder (no source link)