action queues
fluxionary

provides an API for queuing things for batch processing w/ various ways to specify the batch "size".

Keyevent
DS

Adds an event for when player presses a key.

Multiblock Lib
Mindcool25

Multiblock structure handler

Luarocks Wrapper
lazerbeak12345

Securely Wrap Luarocks packages without needing trusted mods.

Select Item
Wuzzy

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

Cid Music Player
ekl

Plays music

Scripted World Editor
Neuromancer

API that allows you pass in scripting tables to fill a series of shapes of different sizes with different nodes

Level API
Hypernoot

A library for games to load levels defined as schematics

Anti Exploit
LMD

Protects against exploits

Shop Dialog
1F616EMO

Formspec-based shop dialog

Weapons API
Stix

Adds an API to easily register custom weapons

Prop Hunt Modpack
Jo5629_

Transform into nodes and with a minigame.

LCD Font
Nazalassa

A simple font for font_api

Stopwatch
sorcerykid

Stopwatch is Lua-based benchmarking API for developers

IntelligenceFramework
PlamiumAI

Provide an AI RNN API for developers.

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

Babelfish Redo
1F616EMO

Translate chat messages into other languages

filter++ lib
rstcxk

provides an API for filtering text

Stent
AFCM

A formspec based arena entrance type for arena_lib

Job Control Mod
sorcerykid

A more flexible alternative to the builtin minetest.after function

Smart Chat
Clyde

A new, lightweight, simple and modular Chatsystem

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

MFSM Multiple Finite State Machine
Sumi

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

Tips
1F616EMO

Send tips to newcomers

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

Advance ore API
Sere Motsatt

Create complex minerals the easy way

Entity Control Function Library
Noodlemire

Adds functions to override and unregister entities.

Node Damage
Noodlemire

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

Advanced Forceload
Kimapr

a better forceloading API

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

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.