Node Damage
Noodlemire

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

item_monoids
fluxionary

an API for controlling item properties via monoids

LCD Font
Nazalassa

A simple font for font_api

Player Settings
1F616EMO

Player-specific settings

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

Signs Redux
sorcerykid

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

Dialogs
1F616EMO

Dialogs with options

B.W Protection
Logikí

This gives API for bad words detection

flinv
Luke

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

Gettime
1F616EMO

A api to get in-game hour/minute

node entity queue
fluxionary

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

GroupLib
rudzik8

General grouping API

Timekeeper
sorcerykid

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

Database Manager
AFCM

Database Manager API

BigNum
ThePython10110

A library that adds a data type for arbitrary precision integers

Lockbox
Jo5629_

Library for cryptography/encryption functions.

YALib
hutzdog

Yet Another Library

aSignals
Sumi

Signal event bus API including SIGNAL, LISTEN and CONDITIONAL functions

Advanced Chat
LMD

A library for advanced chatting.

Random API
TheFanne

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

Callbacks API
ANAND

callbacks_api is a framework for registering callbacks if the callback registration function exists, else returns gracefully.

Minetest Teams
pl608

simple multiplayer team system

ConfigFileLibrary
Tomlaus

A library that allows loading and saving data from config files.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

more_player_monoids
fluxionary

more player monoids

YL Ticker
AliasAlreadyTaken

Displays messages once per timeframe

SmartFS
rubenwardy

A library to allow mods to make Formspecs, a form of GUI, easily.

Tasks Framework
AntumDeluge

Framework for adding tasks & quests.

Advance ore API
Sere Motsatt

Create complex minerals the easy way

Guider
1F616EMO

HUD markers for navigation

Local Time and Date Api
Bob64

Provides an API for other mods to use to get a user's preferred date and time format/time zone based on their configured settings

Chat Games API
Impulse

An API to build chatgames like those in the chatgames

MQTT Client Library
Tuxilio

A mod for MQTT communication

Wield Gadgets
1F616EMO

Register gadgets that can be used with a hotkey

afk_api
fluxionary

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

Select Item
Wuzzy

Allows other mods to add a simple form to choose a single item.

Promise Stuff
jwmhjwmh

A promise library

balanced diet
fluxionary

api for specifying multiple dimensions to eating

canonical name
fluxionary

api to get the proper capitalization of a name

typeof
TPH

Provides functionality similar to Luau's "typeof" function