Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Events API
TPH

API for creating, handling, and permitting function registration calls for custom events

The Mob API
TX_Miner

Provides a simple API for mobs

Fbt Core
Forburnt

A set of utils for other fbt_* mods

Babelfish Redo
1F616EMO

Translate chat messages into other languages

Stent
AFCM

A formspec based arena entrance type for arena_lib

Smart Chat
Clyde

A new, lightweight, simple and modular Chatsystem

Persistent Effects
epCode

An API for creating persistent effects for any object. eg. damage a player or entity over time. (like poison)

Wield Events
mt-mods

Events for wield item switching

Entity Control Function Library
Noodlemire

Adds functions to override and unregister entities.

Face Objects
1F616EMO

Calculate the facing of objects

Node Damage
Noodlemire

Enables nodes to be partially damaged, and to be repaired afterwards.

Function Delayer
Hybrid Dog

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

Minebase Core
ThatCommand

Adds APIs and new dynamic functionalities.

Position listeners library
karamel

Players' position observing library

Exploding Chest
Coder12

Api-mod to allow containers like chest to explode if it contains explosive materials.

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

player attributes
fluxionary

API for defining abstract, compositional player attributes

Antigrief
sorcerykid

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

Player Visibility Api
erov

Easily manage player visibility in a similar way to area protection

Smart Vector Table
Noodlemire

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

status effects
fluxionary

api for defining player status effects

Bedrock Markup Language
sorcerykid

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

Nametags2
Logikí

Allow objects had nametags with observers, colors and range

Minetest Systemd (API)
Piezo_

Debugging utility and compatibility tools for server owners and/or modpack creators

CentralAuth
1F616EMO

Player account unification across Luanti servers

Extended Protection
1F616EMO

Extended interaction restriction rule

Compression Lib
The4spaceconstants

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

flinv
Luke

API to add new inventory tabs which work across different inventory mods

AFK Indicator
1F616EMO

API to check player AFK status

Library Mount
Panquesito7

API Framework for mounting objects.

Timekeeper
sorcerykid

Timekeeper acts as a centralized dispatcher for all time-sensitive routines

Guider
1F616EMO

HUD markers for navigation

Tasks Framework
AntumDeluge

Framework for adding tasks & quests.

Gettime
1F616EMO

A api to get in-game hour/minute

Metatable Metamethods Fixes + Customization
TPH

Attempts to fix issues with metamethods for Lua 5.1 as well as adding new ones + custom functions

Echo
1F616EMO

In-game notification system

node entity queue
fluxionary

a queue for spreading out the generation of node entities over multiple server steps (smartshops, signs, itemframes, etc).

Matrix Chat
joenas

This mod creates a bridge between a Matrix channel and the in-game chat!

GroupLib
rudzik8

General grouping API