NameGen
cronvel

Name generator API.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

NodeCore Staybs API
Winter94

Movement parameters for various 'staybs'

Discrete Player API
Hypernoot

A library for games which attaches players to node grid

Sway
lazerbeak12345

A simple inventory that makes use of Flow forms.

Antigrief
sorcerykid

An API for validating node and item placement via a simple callback mechanism.

Nametags2
Logikí

Allow objects had nametags with observers, colors and range

HTML to Luanti Hypertext
1F616EMO

Convert HTML to Luanti Hypertext for formspecs

afk_api
fluxionary

an API for registering events which trigger when a player goes AFK or comes back from AFK.

Player Settings
1F616EMO

Player-specific settings

Minetest Teams
pl608

simple multiplayer team system

Compression Lib
The4spaceconstants

A library that provides functions to procedurally register compressed versions of nodes.

Wield Events
mt-mods

Events for wield item switching

Quest Framework
TeTpaAka

Simple framework to define quests.

FS51
Luke

Compatibility layer for formspecs

name monoid
fluxionary

flexible control of a player's nametag

CentralAuth
1F616EMO

Player account unification across Luanti servers

deploader
LuantistDork

Simple mod API that automates dependency-specific behaviour using a folder-heavy approach.

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.

Chunk Version
Sumi

Stores the numerical version a chunk was generated, so that other mods may query this.

color_lib
bookgirl

adds HEX colouring

Lush
rstcxk

fully featured shell interpreter

Extended Protection
1F616EMO

Extended interaction restriction rule

MFSM Multiple Finite State Machine
Sumi

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

TPH's Basic Filesystem
TPH

API for loading files into a basic readable format as well as loading and converting conf files

Table Goodies
benrob0329

A small package for extra (can't live without) functions for working with tables.

Bedrock Markup Language
sorcerykid

Bedrock Markup Language is an extensible markup language and API for formspecs.

Grenades API
LandarVargan

Adds an API for easily creating grenades

Smart Vector Table
Noodlemire

API that adds a way to create tables indexed by 3D Vectors.

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

YL Scheduler
AliasAlreadyTaken

Execute tasks based on utc

Function Delayer
Hybrid Dog

Allows executing functions after a delay to reduce possible lag (EDD scheduler?)

Wield Gadgets
1F616EMO

Register gadgets that can be used with a hotkey

Complete and Total Lua-Only Inventory Rewrite
Noodlemire

Creates a completely custom inventory system, which doesn't rely at all on any of the usual UserData objects.

Advanced Rangefinder
sorcerykid

Extends the API with search capabilities for entities

MQTT Client Library
Tuxilio

A mod for MQTT communication

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

An API for automatically registering recipes, nodes and ore generation.

timehud
bookgirl

Minimal HUD timer API

GroupLib
rudzik8

General grouping API