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

Throwable Bombs
DragonWrangler

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

Mob Biome Mapper
Neuromancer

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

Nether Mobs
Dirkfried

Add monsters and dragons to your nether world.

Mob Mese Monster Classic
TenPlus1

Adds classic Mese Monster.

Vegan Misc.
AirplaneMan

Adds vegan alternatives for there are no mob drops avialable

More Danger
Twinsonian

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

Disable Mob Damage for Advanced Trains
Silver Sandstone

Prevents trains from damaging mobs.

Large Slugs
jwmhjwmh

Adds node-based slug mobs to your world

Mobkit Sapien
LuantistDork

Adds villager like mobs using Mobkit.

Alive AI
AiTechEye

Advanced survivor ai mobs (npc, monsters and more)

Balrog Sword MT 5.4
DragonWrangler

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

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

GetName
kevins

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

Mobs Monster
TenPlus1

Adds many types of monster.

Hud Hider
Hito Hito

Make your hud invisible on mobile.

Living Slimes
EmptyStar

Adds living slime mobs

Infectious
KPCOFGS

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

Mobs Ethereal Bosses
PixelZone

Adds 3 bosses to some biomes..

Mobile Crosshair
GreenXenith

It's a crosshair for mobile.

Mobs NPC
TenPlus1

Adds simple NPC and Trader.

Mobs Redo API
TenPlus1

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

Mobs Skeletons
TenPlus1

Adds three skeletons to the 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

Extreme Randomizer
NO11

Randomises crafting, mob and block drops.

Common Mob Interface
Byakuren

A standard modding interface for interacting with mobs

MFSM Multiple Finite State Machine
Sumi

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

Creatura
ElCeejo

A performant, semi-modular, Animal focused mob API

mime (flux's fork)
fluxionary

adds a monster mimicking its surrounding nodes.

Spawners
SaKeL

Adds spawners for mobs, dungeons, temples and ores.

Mob Core
mt-mods

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

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.

Moblib
LMD

Low-level high-performance entity library

Mesebox
johalun

Mobile storage box powered by Mese

Wilhelmines Marinara Mobs
Liil

adds mobs to the marinara oceans

Banshee
ElCeejo

Adds Banshees, a ghostly mob that haunts pine forests

The Mob API
TX_Miner

Provides a simple API for mobs