The Monsters Know What They're Doing 2 (moar)     Dungeons And Dragons (no source link)
Angry Golem (web)     D&D 5e original/official source
Pathfinder 1e Bestiary 2     Pathfinder original/official source
Pathfinder 2e Bestiary 1     Pathfinder original/official source
Volo's Guide To Monsters     D&D 5e original/official source
Monster Manual 3     D&D 4e (no source link)
D&D 2e Monstrous Manual     D&D 2e original/official source
Scruffy Grognard's Monstrous Manual     D&D 2e (no source link)
AD&D Monster Manual     AD&D 1e (no source link)
Hacklopedia Of Beasts     Hackmaster original/official source
QUERP Bestiary     QUERP original/official source
The Monster Overhaul     OSR (no source link)