Lockbox
Jo5629_

Library for cryptography/encryption functions.

Multiblock Lib
Mindcool25

Multiblock structure handler

Dialog Redo
1F616EMO

Flexable dialog API

Library Mount
Panquesito7

API Framework for mounting objects.

Luarocks Wrapper
lazerbeak12345

Securely Wrap Luarocks packages without needing trusted mods.

status effects
fluxionary

api for defining player status effects

CentralAuth
1F616EMO

Player account unification across Luanti servers

item_monoids
fluxionary

an API for controlling item properties via monoids

Advanced Forceload
Kimapr

a better forceloading API

balanced diet
fluxionary

api for specifying multiple dimensions to eating

Flow Extras
lazerbeak12345

An experimental collection of extra widget APIs for flow

Level API
Hume2

A library for games to load levels defined as schematics

Discrete Player API
Hume2

A library for games which attaches players to node grid

Bedrock Markup Language
sorcerykid

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

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Stopwatch
sorcerykid

Stopwatch is Lua-based benchmarking API for Minetest developers

Player Settings
1F616EMO

Player-specific settings

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Nametags2
Logikí

Allow objects had nametags with observers, colors and range

Timed World Modifiers library
karamel

Environmental ABM that could be triggered on a very wide range of nodes but only a few at a time.

Virt
frogTheSecond

A library for (qemu) virtual machines

YALib
hutzdog

Yet Another Library

Node Object
jwmhjwmh

A library for associating objects with nodes

Item Tracking
Impulse

Provides a API to mod developers to track which inventories items are in.

Persistent Effects
epCode

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

group:any
1F616EMO

Item group applied to ALL items for crafting recipes.

name monoid
fluxionary

flexible control of a player's nametag

FS51
Luke

Compatibility layer for formspecs

Promise Stuff
jwmhjwmh

A promise library

NameGen
cronvel

Name generator API.

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

AFK Indicator
1F616EMO

API to check player AFK status

Babelfish Redo
1F616EMO

Translate chat messages into other languages

Echo
1F616EMO

In-game notification system

Smart Vector Table
Noodlemire

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

Advanced Chat
LMD

A library for advanced chatting.

Minetest HTTP API QoS control queue
SX

Improve quality of important HTTP requests by grouping requests into service quality buckets.

Key Binding
1F616EMO

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

DataMiner
sorcerykid

DataMiner is an analytical tool for server operators with a feature-rich API for customized report generation

Tasks Framework
AntumDeluge

Framework for adding tasks & quests.