Kriegsland Enemies Pack is, as you can imagine, the monsters only version of the Wolfenstein mod by GAA1992 and YukesVonFaust, Kriegsland, made for you to play with other weapons' mods etc.
Kriegsland Enemies Pack is the monster pack edition of the Doom mod based on the Wolfenstein franchise’s games (specially The New Order) developed by GAA1992 and Yukes Von Faust, Kriegsland.
This monsters only Kriegsland’s version is especially useful to be combined with weapon packs, keeping its enemies visuals, behaviors, sound effects, and drops. In fact, there are adaptations for some customized death from PWADs like Beautiful Doom and Final Doomer. Besides the monsters, the mod also keeps the difficulty levels from Kriegsland: Genocide, Homicide and Suicide.
I ran the mod here on GZDoom (2.4 and 3.2) and on Zandronum 3.0, with the IWADs from Doom II: Hell on Earth, The Ultimate Doom, Final Doom, Heretic and Freedoom.