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.

Moblib
LMD

Low-level high-performance entity library

Not So Simple Mobs
TenPlus1

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

Mobs Redo API
TenPlus1

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

Invisiblocks
TenPlus1

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

Mobs Takodachi
Silver Sandstone

Adds takodachis.

Throwable Bombs
DragonWrangler

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

Water Mobs
TenPlus1

Water Mobs for Mobs Redo

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

Wisps
ElCeejo

Adds non-entity mobs called Wisps

Large Slugs
jwmhjwmh

Adds node-based slug mobs to your world

Balrog Sword MT 5.4
DragonWrangler

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

Slimes Redo
TenPlus1

Add green and lava slimes to your world.

3D Armor Mobile
LandarVargan

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

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Sky Mobs
TenPlus1

Sky Mobs for Mobs Redo

mime (flux's fork)
fluxionary

adds a monster mimicking its surrounding nodes.

Mesebox
johalun

Mobile storage box powered by Mese

MobConf
zeuner

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

Mobile Crosshair
GreenXenith

It's a crosshair for mobile.

Extreme Randomizer
NO11

Randomises crafting, mob and block drops.

Zoonami 3D Mobs
isaiah658

Adds 3D monster mobs to Zoonami.

Living Slimes
EmptyStar

Adds living slime mobs to Minetest

Mob Crab (Beta)
Can202

Adds Crabs.

Mobs Ghost Redo
TenPlus1

Adds ghosts.

Mob Biome Mapper
Neuromancer

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

Banshee
ElCeejo

Adds Banshees, a ghostly mob that haunts pine forests

Mob Horse
TenPlus1

Adds rideable horse

balrog (flux's fork)
fluxionary

adds balrogs.

Hud Hider
Hito Hito

Make your hud invisible on mobile.

Wilhelmines Living Caves Mobs
Liil

adds mobs to the caves of your world

Too Many Aliases
ThePython10110

Adds aliases to every item/node in MineClone to make them match MineCraft so you can stop forgetting that mcl_mobitems:ender_pearl should be mcl_throwing:ender_pearl.

More Danger
Twinsonian

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

Mobkit
mt-mods

Entity API

Mobs Skeletons
TenPlus1

Adds three skeletons to the world.

Mob BiomeDb Mapper
Neuromancer

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

S Battlehammer
Stakbox

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

X Spawners Mobs
SaKeL

Adds mob spawners.