Pathfinder 1e Bestiary 2     Pathfinder original/official source
Mythic Monster Manual v2     Pathfinder original/official source
Forgotten Foes     Pathfinder original/official source
Untamed Wilds     D&D 5e original/official source
Critter Compendium     D&D 5e original/official source
Dragon Magazine     D&D 2e/3e (no source link)