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.

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Large Slugs
jwmhjwmh

Adds node-based slug mobs to your world

Mob Limiter
Neuromancer

removes mobs over max count near players with configurable settings

Common Mob Interface
Byakuren

A standard modding interface for interacting with mobs

MobConf
zeuner

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

Balrog Sword MT 5.4
DragonWrangler

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

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

Water Mobs
TenPlus1

Water Mobs for Mobs Redo

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

Disable Mob Damage for Advanced Trains
Silver Sandstone

Prevents trains from damaging mobs.

Mob Biome Mapper
Neuromancer

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

Mobs Skeletons
TenPlus1

Adds three skeletons to the world.

Mobs Redo API
TenPlus1

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

balrog (flux's fork)
fluxionary

adds balrogs.

Moblib
LMD

Low-level high-performance entity library

Mesebox
johalun

Mobile storage box powered by Mese

Mobs Takodachi
Silver Sandstone

Adds takodachis.

More Danger
Twinsonian

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

Mobs Monster
TenPlus1

Adds many types of monster.

3D Armor Mobile
LandarVargan

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

Mobs Ghost Redo
TenPlus1

Adds ghosts.

Mob Mese Monster Classic
TenPlus1

Adds classic Mese Monster.

X Spawners Mobs
SaKeL

Adds mob spawners.

Invisiblocks
TenPlus1

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

Wisps
ElCeejo

Adds non-entity mobs called Wisps

Lategame Amulets
Comet

A cohesive progression system that builds on Mobs Monster

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.

Sky Mobs
TenPlus1

Sky Mobs for Mobs Redo

Extreme Randomizer
NO11

Randomises crafting, mob and block drops.

Mobile Crosshair
GreenXenith

It's a crosshair for mobile.

Grave
ElCeejo

Adds an eerie biome with multiple mobs.

Mob Horse
TenPlus1

Adds rideable horse