OSE Encounter Activity Tables     Any original/official source
Pathfinder 1e Bestiary 1     Pathfinder original/official source
Pathfinder 2e Bestiary 1     Pathfinder (no source link)
Mythic Monster Manual v1     Pathfinder (no source link)
MojoBob (web)     D&D 2e (no source link)
D&D 2e Monstrous Manual     D&D 2e (no source link)
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)
Dragonlance Bestiary     SAGA (no source link)
Hacklopedia Of Beasts     Hackmaster original/official source
Monsters Compendium     Heroes Of Adventure (no source link)
Monsters Of Luclin     Everquest original/official source
Lairs And Encounters     Adventurer, Conqueror, King (no source link)