More posibilities how to kill mobs/players
SFENCE

Add more posibilities how to kill mobs and/or players, like traps, throwable TNT, etc.

Traders
Sokomine

Configurable mobs/NPC which can trade for you.

Visual Harm 1Ndicators
Mantar

HP bars for mobs/players

Mobkit Sapien
nurd3

Adds villager like mobs using Mobkit.

Mobs Ethereal Bosses
PixelZone

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

Nether Mobs
Dirkfried

Add monsters and dragons to your nether world.

Skeleton
AntumDeluge

A skeleton mob.

MobConf
zeuner

Place, remove and configure Mobs (for now: NPCs) using chatcommands

GetName
kevins

Adds an API and tool to generate random names for NPCs, mobs, and places.

Creatura
ElCeejo

A performant, semi-modular, Animal focused mob API

Balrog Sword MT 5.4
DragonWrangler

allows those using the old mobs balrog mod to have balrog swords

Wisps
ElCeejo

Adds non-entity mobs called Wisps

Mob Limiter
Neuromancer

removes mobs over max count near players with configurable settings

Water Mobs
TenPlus1

Water Mobs for Mobs Redo

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Mob Horse
TenPlus1

Adds rideable horse

Common Mob Interface
Byakuren

A standard modding interface for interacting with mobs

Mobile Crosshair
GreenXenith

It's a crosshair for mobile.

Mobs Redo API
TenPlus1

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

Climbing Pick
lag01

Tool to climb, double jump, and do good damage to mobs.

Mob BiomeDb Mapper
Neuromancer

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

Zoonami 3D Mobs
isaiah658

Adds 3D monster mobs to Zoonami.

Living Slimes
EmptyStar

Adds living slime mobs to Minetest

Mobs Effects
SFENCE

Provides predefined attribute effects without apply logic for mobs based on Mobs Redo API, modifying movement, combat, and behavior attributes

Invisiblocks
TenPlus1

Add invisible barrier, light and mob wall into game with new tool

MFSM Multiple Finite State Machine
Sumi

Allows for multple states to be active, while maintaining typical state machine behavior. Good for gamestate and mobs.

mime (flux's fork)
fluxionary

adds a monster mimicking its surrounding nodes.

Banshee
ElCeejo

Adds Banshees, a ghostly mob that haunts pine forests

Not So Simple Mobs
TenPlus1

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

Mob Biome Mapper
Neuromancer

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

Mesebox
johalun

Mobile storage box powered by Mese

balrog (flux's fork)
fluxionary

adds balrogs.

Mobs Ghost Redo
TenPlus1

Adds ghosts.

Mobs Takodachi
Silver Sandstone

Adds takodachis.

3D Armor Mobile
LandarVargan

Adds a command to bring up a formspec that allows mobile users to put on armor

Throwable Bombs
DragonWrangler

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

Mobs Monster
TenPlus1

Adds many types of monster.

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

Large Slugs
jwmhjwmh

Adds node-based slug mobs to your world

Disable Mob Damage for Advanced Trains
Silver Sandstone

Prevents trains from damaging mobs.