Pathfinder 1e Bestiary 2     Pathfinder original/official source
Pathfinder 2e Bestiary 1     Pathfinder original/official source
Tome Of Horrors Complete     Pathfinder original/official source
Mythic Monster Manual v2     Pathfinder original/official source
Monster Manual Expanded v3     D&D 5e original/official source
Fifth Edition Foes     D&D 5e original/official source
MojoBob (web)     D&D 2e original/official source
D&D 2e Monstrous Manual     D&D 2e original/official source
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)