The Mob API
TX_Miner

Provides a simple API for mobs

Template to Easily Make Fancy Voxelized Models
Noodlemire

Provides voxelmodel.obj, a model designed to be shaped by changing its texture, in order to easily create fancy voxelized models.

Archipelago Library
Warr1024

Archipelago multi-world randomizer integration library

Interactive Item API
Jose_ManuelS18

Provides an API to make it easier to implement items' inner workings.

Item Holders
Jose_ManuelS18

Adds 'Item Holders', blocks that hold your items in display, also provides a API.

Doclib
joe7575

A library to generate ingame manuals based on markdown files.

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

Weapons API
Stix

Adds an API to easily register custom weapons

Interchangeable Hands
octacian

Demonstration of Luanti's capability to dynamically change the player hand.

Item Help
Wuzzy

Adds automatically generated help texts for items.

Guider
1F616EMO

HUD markers for navigation

GetName
kevins

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

Player Visibility Api
erov

Easily manage player visibility in a similar way to area protection

status effects
fluxionary

api for defining player status effects

Advanced Fight Library
SFENCE

Library for implementing advanced combat systems with hitbox-based damage and body part health tracking

Players Effects
SFENCE

Provides predefined attribute effects for players ncluding movement, vision, and brain concussion effects. Apply logic is not included.

Star
Wiz

A* Pathfinding algorithm implementation

Smart Chat
Clyde

A new, lightweight, simple and modular Chatsystem

Keyevent
DS

Adds an event for when player presses a key.

Inventory Change Callback
luarocks

Provide a global callback for handling player inventory changes.

NameGen
cronvel

Name generator API.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Ediblestuff API
lazerbeak12345

A unified API for making items, tools and armor edible. Eat armor while wearing it!

Tasks Framework
AntumDeluge

Framework for adding tasks & quests.

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Chatcommand Library
LMD

Library for registering chatcommands.

NodeCore Staybs API
Winter94

Movement parameters for various 'staybs'

Entity Control Function Library
Noodlemire

Adds functions to override and unregister entities.

Sway
lazerbeak12345

A simple inventory that makes use of Flow forms.

Nametags2
Logikí

Allow objects had nametags with observers, colors and range

HTML to Luanti Hypertext
1F616EMO

Convert HTML to Luanti Hypertext for formspecs

Minetest HTTP API QoS control queue
SX

Improve quality of important HTTP requests by grouping requests into service quality buckets.

Unified Stamina API
TestificateMods

Provides a universal API for handling different mods that provide a stamina bar

Player Settings
1F616EMO

Player-specific settings

Quest Framework
TeTpaAka

Simple framework to define quests.

FS51
Luke

Compatibility layer for formspecs

name monoid
fluxionary

flexible control of a player's nametag

Scripted World Editor
Neuromancer

API that allows you pass in scripting tables to fill a series of shapes of different sizes with different nodes

action queues
fluxionary

provides an API for queuing things for batch processing w/ various ways to specify the batch "size".

Seasons Clock
solsword

API for getting various "season" parameters based on server time and a few customiable settings. Doesn't change gameplay; just a library that other mods can use to do seasonal things.