Minetest Systemd (API)
Piezo_

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

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

Advanced Forceload
Kimapr

a better forceloading API

AoM Settings
Sumi

Provides methods for both player level and server level settings

afk_api
fluxionary

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

Table Goodies
benrob0329

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

Telegram
neko259

Integration with telegram messenger chat

Player Visibility Api
erov

Easily manage player visibility in a similar way to area protection

rcsv
Wuzzy

RFC-4180-compliant CSV parser and writer

Wield Gadgets
1F616EMO

Register gadgets that can be used with a hotkey

Simple notification wrapper
KirowL

This project offers a Notification System API to display temporary messages on the player's screen, allowing seamless integration of notifications into gameplay.

Promise Stuff
jwmhjwmh

A promise library

balanced diet
fluxionary

api for specifying multiple dimensions to eating

HTML to Luanti Hypertext
1F616EMO

Convert HTML to Luanti Hypertext for formspecs

canonical name
fluxionary

api to get the proper capitalization of a name

Chat Games API
Impulse

An API to build chatgames like those in the chatgames

Minetest Teams
pl608

simple multiplayer team system

Dialogs
1F616EMO

Dialogs with options

Stent
AFCM

A formspec based arena entrance type for arena_lib

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

Key Binding
1F616EMO

Register callbacks when a key is pressed, holded, or released.

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!

DeltaTime
SkyBuilder1717

Adds deltatime API

Dialog Redo
1F616EMO

Flexable dialog API

GroupLib
rudzik8

General grouping API

YL Scheduler
AliasAlreadyTaken

Execute tasks based on utc

More vector helpers
Hybrid Dog

Adds more vector functions.

Random API
TheFanne

Provides a simple-to-use framework for selecting random objects with probabilities

Signs Redux
sorcerykid

Signs Redux is a complete rewrite of default signs that adds many new features

Node Object
jwmhjwmh

A library for associating objects with nodes

Shop Dialog
1F616EMO

Formspec-based shop dialog

Pluggable Helpers
sorcerykid

Automated dependency management of helper functions within a distributed architecture

Database Manager
AFCM

Database Manager API

BigNum
ThePython10110

A library that adds a data type for arbitrary precision integers

YL Ticker
AliasAlreadyTaken

Displays messages once per timeframe

Lockbox
Jo5629_

Library for cryptography/encryption functions.

YALib
hutzdog

Yet Another Library

Operating System Detector
TPH

Checks the OS of the device running the mod.