Ediblestuff Api
lazerbeak12345

API for making specific tools and armor edible

Oreveins
ApolloX

A node which produces ores

House Windows
DiamondPlane

Adds windows for your house

LWDrops
loosewheel

Utility to store large item metadata strings to file/s when dropped.

markdown2formspec
Just_Visiting

A markdown to Formspec Utility

Complete and Total Lua-Only Inventory Rewrite
Noodlemire

Creates a completely custom inventory system, which doesn't rely at all on any of the usual UserData objects.

Smart Vector Table
Noodlemire

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

Tools Using the Node Damage and Repair System
Noodlemire

Overrides pre-existing tools to make them cause persistent node damage.

Biome generator for Lua mapgens
Gaël de Sailly

Library to provide biomes and decorations for compatible Lua mapgens.

3D Armor Light
AntumDeluge

Wielded Light for 3d_armor

Database Manager
AFCM

Database Manager API

YAML Config File Library
snowyu

Load or Save YAML config file

Playereffects
Wuzzy

Framework for temporary effects for players.

World Data Manager Library
AntumDeluge

A library for managing data files in the world directory.

Sounds
AntumDeluge

A set of free sounds & API.

Discord-Minetest Relay
archfan7411

Mod + external program providing Discord relaying and commands.

Power Rangers Modpack
LC Creations

Adds power rangers and an API to create your own.

Lambda
benrob0329

Atomic lambda string-parser for Lua.

Discrete Player API
Hume2

A library for games which attaches players to node grid

Level API
Hume2

A library for games to load levels defined as schematics

Item Help
Wuzzy

Adds automatically generated help texts for items.

Appliances API
SFENCE

API for create appliances in other mods powered by technic, mesecons or hand.

HUD FS
luk3yx

A library to make HUDs from formspecs

FS51
luk3yx

Compatibility layer for formspecs

Minetest HTTP API QoS control queue
SX

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

Mapblock Lib
BuckarooBanzai

mapblock serialization functions

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.

Subcommands
Emojiminetest

API to make commands with subcommands

Natural slopes library
karamel

Library to simply add slopes to regular nodes and include them on map generation and when changing the landscape.

Position listeners library
karamel

Players' position observing library

Autobox
Just_Visiting

Auto Collision/Selection Loading Boxes

i3
jp

A next-generation inventory

Controls
BuckarooBanzai

Utility library for control press/hold/release events

Name Generator
FaceDeer

A lua library for generating random names based off of rulesets and syllable lists.

Achievements Lib
Zughy

API to store all your achievements in one place

Mob Core
ElCeejo

A Mob API meant to expand upon mobkit and bring easy to use features for creating new Mobs.

Scarlet
sorcerykid

Scarlet is a thin-wrapper library that simplifies the layout of formspec elements.

Timekeeper
sorcerykid

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

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Formspec AST
luk3yx

A library to help other mods interpret formspecs.