PaleoTest
ElCeejo

Adds Prehistoric Fauna and Flora to Minetest Game

Mobs Ethereal Bosses
DuckGo

Add Bosses to "Ethereal NG" biomes!

Wilhelmines People
Liil

Adds the possibility to build living Villages. Trade items for random stuff from your villagers, recruit mounts and warriors.

Forgotten Monsters
DuckGo

Monsters and Bosses...

Wisps
ElCeejo

Adds non-entity mobs called Wisps

Zombies4Test
DuckGo

Adds zombies and stuff to your world

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Native Villages
Liil

Adds villages of native people to the world.

Slimes inspired by TheManaWorld
Piezo_

Adds several types of slimes inspired by TheManaWorld

balrog (flux's fork)
fluxionary

adds balrogs.

Power Rangers Modpack
LC Creations

Adds power rangers and an API to create your own.

pilzmod
Phii

a spreading mushroom biome which you can spawn into the world, with its own monsters and a boss you need to slay to stop the biome's growth. Best played with bow & armor mod and after reading manual.

Grave
ElCeejo

Adds an eerie biome with multiple mobs.

mime (flux's fork)
fluxionary

adds a monster mimicking its surrounding nodes.

NodeCore SeaLife
Winter94

Adds Biodiversity to NodeCore Seas & Rivers

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

Nether Mobs
rael5

Add monsters and dragons to your nether world.

Ocular Networks
PolySaken

Draw power from the world, and use it to power machines and tools.

Banshee
ElCeejo

Adds Banshees, a ghostly mob that haunts pine forests

PaleoTest for Hades Revisited
SFENCE

Adds Not Only Prehistoric Fauna and Flora to Hades Revisited.