More posibilities how to kill mobs/players
SFENCE

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

Visual Harm 1Ndicators
Mantar

HP bars for mobs/players

Traders
Sokomine

Configurable mobs/NPC which can trade for you.

Infectious
KPCOFGS

Aggressive apocalyptic zombies that infect all animalia mobs. Immune to sunlight, fast, and deadly.

Hud Hider
Hito Hito

Make your hud invisible on mobile.

Banshee
ElCeejo

Adds Banshees, a ghostly mob that haunts pine forests

Creatura
ElCeejo

A performant, semi-modular, Animal focused mob API

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

Juha Get
Juha (CraftPlay777)

Gives you any block, liquid, or mob spawn egg you're looking at

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Not So Simple Mobs
TenPlus1

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

Mob Core
mt-mods

A Mob API meant to expand upon mobkit and bring easy to use features for creating new Mobs.

Mobs Ghost Redo
TenPlus1

Adds ghosts.

Slimes Redo
TenPlus1

Add green and lava slimes to your world.

Disable Mob Damage for Advanced Trains
Silver Sandstone

Prevents trains from damaging mobs.

Nether Mobs
Dirkfried

Add monsters and dragons to your nether world.

S Battlehammer
Stakbox

Adds a battlehammer weapon with high knockback for MTG (compatible only with Mobs Redo API).

Mobs Redo API
TenPlus1

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

Mobs Monster
TenPlus1

Adds many types of monster.

Zoonami 3D Mobs
isaiah658

Adds 3D monster mobs to Zoonami.

Vegan Misc.
AirplaneMan

Adds vegan alternatives for there are no mob drops avialable

Mobs Animal
TenPlus1

Adds farm animals.

Mobs Skeletons
TenPlus1

Adds three skeletons to the world.

Mobkit Sapien
LuantistDork

Adds villager like mobs using Mobkit.

Mob Horse
TenPlus1

Adds rideable horse

mime (flux's fork)
fluxionary

adds a monster mimicking its surrounding nodes.

Raids
DragonWrangler

Allows server owners or server admin to start mob raids to attack settlements or players

Mobile Crosshair
GreenXenith

It's a crosshair for mobile.

Balrog Sword MT 5.4
DragonWrangler

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

The Mob API
TX_Miner

Provides a simple API for mobs

Wilhelmines Living Caves Mobs
mt-mods

adds mobs to the caves of your world

Healing Stick
Vasiliy

heals mobs and players

3D Armor Mobile
LandarVargan

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

Mob Limiter
Neuromancer

removes mobs over max count near players with configurable settings

More Danger
Twinsonian

Scaling difficulty multiple games/mob apis. Based on the difficulty mobs will have faster movement speed, more damage and more health.

Mob Mese Monster Classic
TenPlus1

Adds classic Mese Monster.

MobConf
zeuner

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

Moblib
LMD

Low-level high-performance entity library

Mob Crab (Beta)
Can202

Adds Crabs.

Minec##ft Items and Mobs for Mineclonia
michi16bit

Add minecraft mobs and items