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

Nether Mobs
Dirkfried

Add monsters and dragons to your nether world.

Mesebox
johalun

Mobile storage box powered by Mese

Mobkit Sapien
LuantistDork

Adds villager like mobs using Mobkit.

Balrog Sword MT 5.4
DragonWrangler

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

Lategame Amulets
Comet

A cohesive progression system that builds on Mobs Monster

Mob Crab (Beta)
Can202

Adds Crabs.

Mobs Skeletons
TenPlus1

Adds three skeletons to the world.

Mob Horse
TenPlus1

Adds rideable horse

Wilhelmines Living Caves Mobs
mt-mods

adds mobs to the caves of your world

Wilhelmines Marinara Mobs
Liil

adds mobs to the marinara oceans

Mob BiomeDb Mapper
Neuromancer

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

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Mobs NPC
TenPlus1

Adds simple NPC and Trader.

Living Slimes
EmptyStar

Adds living slime mobs

3D Armor Mobile
LandarVargan

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

Vegan Misc.
AirplaneMan

Adds vegan alternatives for there are no mob drops avialable

Common Mob Interface
Byakuren

A standard modding interface for interacting with mobs

Mob Biome Mapper
Neuromancer

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

Hud Hider
Hito Hito

Make your hud invisible on mobile.

Spawners
SaKeL

Adds spawners for mobs, dungeons, temples and ores.

Mobkit
mt-mods

Entity API

Mobs Monster
TenPlus1

Adds many types of monster.

Mobs Ghost Redo
TenPlus1

Adds ghosts.

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

Disable Mob Damage for Advanced Trains
Silver Sandstone

Prevents trains from damaging mobs.

Zoonami 3D Mobs
isaiah658

Adds 3D monster mobs to Zoonami.

Invisiblocks
TenPlus1

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

Mobile Crosshair
GreenXenith

It's a crosshair for mobile.

Moblib
LMD

Low-level high-performance entity library

Healing Stick
Vasiliy

heals mobs and players

Better Randomizer
ThePython10110

Randomizes node drops, mob drops, and crafting recipes

Not So Simple Mobs
TenPlus1

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

Minec##ft Items and Mobs for Mineclonia
michi16bit

Add minecraft mobs and items

Mobs Redo API
TenPlus1

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

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.

Throwable Bombs
DragonWrangler

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