TPH's Wielditem
TPH

Wielded Item Events with Prepackaged Wield3d + Wielded Light Functionality!

Slope Lib
epCode

A lib that calculates the average 3d slope of surrounding nodes from a position and raduis.

City Block II
sorcerykid

Disables use of water and lava buckets within a designated area

SkillsFramework
domtron vox

SkillsFramework provides an API for creating and managing skills.

ASCII Art Schematics
Warr1024

Manage Minetest schematics as ASCII art.

mod utilities
theFox

Providing some utilities that can be used by other mods.

country_lib
Zughy

small util library providing country localised names and flags

Item Extensions
Sumi

Support for more callbacks for items, such as `on_step` and `on_select`

QA-Block
bell07

A mods development / QA helper

LEEF math (CPML)
fatalerror420

integrates CPML library from the Love framework community into Minetest

Polygraph
sorcerykid

A formspec-based charting API providing a rich set of output parameters

Botic Font
Pyrollo

Botic font minetest mod for font API

Repixture Crafting Compatibility
Silver Sandstone

Converts crafting recipes to be compatible with Repixture.

Scarlet
sorcerykid

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

Bitwise Operations
sorcerykid

A pure-Lua implementation of common bit-manipulation functions

Luwua
LMD

:3

use_texture_alpha workaround
1F616EMO

Fix boolean use_texture_alpha on MT5.9+

Cycles
1F616EMO

API to cycle though block/item state on certan events

LEEF class lib
fatalerror420

Simple class system for minetest, with a inbuilt read only table system

Treasurer
Wuzzy

A framework to define and distribute random treasures into the world.

Definition Ripper
Warr1024

Generate inert facades from node/item definitions for use in other games

Intllib
kaeza

Internationalization library.

LEEF filesystem
fatalerror420

adds dependencies for binary file reading, as well as other file utilities. Orignally from Modlib

fmod
fluxionary

flux's mod boilerplate

futil
fluxionary

flux's utility mod

Controls
mt-mods

Utility library for control press/hold/release events

panel_lib
Zughy

Library to easily create complex HUDs

Display Modpack
mt-mods

Provides mods with dynamic display and font display: clocks, signs, and more.

LootChests Modpack
mt-mods

Modpack adding a lot of various loot containers across the world to be found and providing an API, resources and integrations for other mods

Player Physics API with Monoid Support
TestificateMods

A patched version of playerphysics with support for player_monoids.

Logging
1F616EMO

Create logging functions for mods easily

ActiveFormspecs
sorcerykid

ActiveFormspecs is a framework that abstracts the builtin formspec API of Minetest

Accuracy
shaft

Accuracy library for mods introducing ranged weapons.

Handle Schematics
Sokomine

A library to make creating and placing saved areas easier.

Configuration Panel
sorcerykid

API extension that allows seamless loading of mod configuration at runtime

Player Effects
Wuzzy

Framework for temporary effects for players.

weapons_lib
Zughy

API to easily create weapons of any kind

Lighting Monoid
TestificateMods

Provides a compatibility API for player lighting

Beds Redux
sorcerykid

A complete rewrite of the Beds mod with many additional features

Adaptation lib and mods
SFENCE

Key based adaptation database of items.