Chat Games API
Impulse

An API to build chatgames like those in the chatgames

Node Object
jwmhjwmh

A library for associating objects with nodes

canonical name
fluxionary

api to get the proper capitalization of a name

Promise Stuff
jwmhjwmh

A promise library

name monoid
fluxionary

flexible control of a player's nametag

GroupLib
rudzik8

General grouping API

Doclib
joe7575

A library to generate ingame manuals based on markdown files.

toolcap_monoids
fluxionary

an API to allow multiple sources to apply changes to a tools's capabilities.

Stent
AFCM

A formspec based arena entrance type for arena_lib

group:any
1F616EMO

Item group applied to ALL items for crafting recipes.

MQTT Client Library
Tuxilio

A mod for MQTT communication

Lambda
benrob0329

Atomic lambda string-parser for Lua.

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

node entity queue
fluxionary

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

Callbacks API
ANAND

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

Extended Protection
1F616EMO

Extended interaction restriction rule

Exploding Chest
Coder12

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

YL Ticker
AliasAlreadyTaken

Displays messages once per timeframe

SmartFS
rubenwardy

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

Tips
1F616EMO

Send tips to newcomers

Lockbox
Jo5629_

Library for cryptography/encryption functions.

Database Manager
AFCM

Database Manager API

YALib
hutzdog

Yet Another Library

Be2een Api
_gianpy_

timers, animation and action! ciack

Basic HUD textures
Wuzzy

Adds basic but neccessary HUD images: Heart icon, bubble icon, … (for game authors)

Intllib
kaeza

Internationalization library.

SSCSM implementation
Luke

A server-sent CSM library.

Newspaper
1F616EMO

A Customizable newspaper

Ambience API
1F616EMO

API for playing background musics

World Storage [deprecated]
Sumi

[DEPRECATED] Allows saving and loading data to the world folder, and offers an alternative to global settings

Player Info [deprecated]
Sumi

[DEPRECATED] Adds a way to track information about the player and controls.

Subcommands
1F616EMO

API to make commands with subcommands

Benchmark Engine
theFox

Engine for running benchmarks ingame.

Handle Schematics
Sokomine

A library to make creating and placing saved areas easier.

Emerald Bank (MineClonia)
N Freeman

Keep your Emeralds in a Bank, a complete economy API

Oreveins
ApolloX

A node which produces ores

World Data Manager Library
AntumDeluge

A library for managing data files in the world directory.

Metavectors
theFox

vectors using metatables to make coding easier

Walkover
lordfingle

A library to make it easier for developers to detect on_walk_over