Traders
Sokomine

Configurable mobs/NPC which can trade for you.

Not So Simple Mobs
TenPlus1

Adds a host of creatures into your world with new weapons too.

Wilhelmines Living Caves Mobs
Liil

adds mobs to the caves of your world

Mobs Monster
TenPlus1

Adds many types of monster.

Mobs Ethereal Bosses
PixelZone

Adds Bosses in biomes from the "Ethereal NG" and "Mineclonia" mods

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Mobs Animal
TenPlus1

Adds farm animals.

Grave
ElCeejo

Adds an eerie biome with multiple mobs.

Sky Mobs
TenPlus1

Sky Mobs for Mobs Redo

Mob Biome Mapper
Neuromancer

Allows mobs to spawn in biomes that don't support them.

Nether Mobs
Dirkfried

Add monsters and dragons to your nether world.

Mob BiomeDb Mapper
Neuromancer

Allows mobs to spawn in biomes that don't support them (Using info from BiomeDb)

mime (flux's fork)
fluxionary

adds a monster mimicking its surrounding nodes.

Throwable Bombs
DragonWrangler

adds a cave expansion tool, a throwable tnt stick, a throwable smoke bomb, and a mob throws tnt

Mob Limiter
Neuromancer

removes mobs over max count near players with configurable settings

Mob Mese Monster Classic
TenPlus1

Adds classic Mese Monster.

Zoonami 3D Mobs
isaiah658

Adds 3D monster mobs to Zoonami.

Mob Horse
TenPlus1

Adds rideable horse

Mobkit
mt-mods

Entity API

Mobs Ghost Redo
TenPlus1

Adds ghosts.

Creatura
ElCeejo

A performant, semi-modular, Animal focused mob API

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

Large Slugs
jwmhjwmh

Adds node-based slug mobs to your world

Spawners
SaKeL

Adds spawners for mobs, dungeons, temples and ores.

Mobkit Sapien
nurd3

Adds villager like mobs using Mobkit.

Wisps
ElCeejo

Adds non-entity mobs called Wisps

X Spawners Mobs
SaKeL

Adds mob spawners.

Water Mobs
TenPlus1

Water Mobs for Mobs Redo

Living Slimes
EmptyStar

Adds living slime mobs to Minetest

Mobs Skeletons
TenPlus1

Adds three skeletons to the world.

Slimes Redo
TenPlus1

Add green and lava slimes to your world.

Mobs Takodachi
Silver Sandstone

Adds takodachis.

balrog (flux's fork)
fluxionary

adds balrogs.

Mob Crab (Beta)
Can202

Adds Crabs.

Banshee
ElCeejo

Adds Banshees, a ghostly mob that haunts pine forests

Tortou
LibraSubtilis

Turtle graphics, hyperloop travelingsystem and cubic mobs.

Common Mob Interface
Byakuren

A standard modding interface for interacting with mobs

Mobs NPC
TenPlus1

Adds simple NPC and Trader.

Wilhelmines Marinara Mobs
Liil

adds mobs to the marinara oceans

Mobs Redo API
TenPlus1

Simple and feature rich API to quickly add mobs into your world.