Pathfinder 1e Bestiary 2     Pathfinder original/official source
Pathfinder 2e Bestiary 2     Pathfinder original/official source
Mythic Monster Manual v2     Pathfinder original/official source
Forgotten Foes     Pathfinder original/official source
Monster Manual Expanded v2     D&D 5e original/official source
Critter Compendium     D&D 5e original/official source
Monster Manual     D&D 4e (no source link)