Here it is, my newest MonsterPack, assembled on 12th May 2024:
https://www.dropbox.com/scl/fi/ve7u2ou2 ... v9oo&raw=1
A picture of all the 563 monsters:

I have created no special sounds for them, with few exceptions. Most of them use the sound from Doom/Heretic/Hexen/Strife.
If anyone would like me to make some new monster - Im all ears.
PS: Some monsters might be too difficult for vanilla doom - thats because some monsters were made for my RPG project, where the player can have thousands of health. Also some might better be given different DECORATE and their own designated maps to look realistic - like the Airplanes.
PPS: Please let me know of any sprite collision you find - with over 500 monsters its easy for me to overlook.
PPPS: Have fun