Pathfinder 1e Bestiary 1     Pathfinder original/official source
Mythical Monsters Revisted     Pathfinder (no source link)
Phoenixes: A Field Guide     Pathfinder (no source link)
Mythic Adventures     Pathfinder original/official source
Monster Monday (web)     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)
Monsters Compendium     Heroes Of Adventure (no source link)
Manual Of Monsters     World Of Warcraft RPG original/official source
QUERP Bestiary     QUERP original/official source
Monsters And Treasure (2019)     Castles And Crusades original/official source
The Atlantean Bestiary     Any original/official source
Baby Bestiary 1     Any original/official source