The Monsters Know What They're Doing 2 (moar)     Dungeons And Dragons (no source link)
Monstrosities     Swords & Wizardry original/official source
Pathfinder 1e Bestiary 1     Pathfinder original/official source
All Sorts Of Critters (web)     Pathfinder original/official source
Exotic Encounters     Pathfinder original/official source
Monster Manual Expanded v2     D&D 5e original/official source
Volo's Guide To Monsters     D&D 5e original/official source