Architect's planner
MatyasP

Add planning plains for loading the textures (sketches)

L-System Tree Utility
Wuzzy

A form to easily spawn L-system trees, aimed at mod developers.

Worldedit Big Schematics Handling
IRI

World Edit commands allowing to create and place large schematics, as well as maintain a command journal for undoing past actions.

PerfHUD
Juri

Adds an HUD which shows some performance stats.

Noise Visualizer
epCode

A Value Noise visualizer.

imfs
Signal_

An immediate-mode, functional, reactive abstraction around Minetest's formspec system.

Library Mount
Panquesito7

API Framework for mounting objects.

Get Item
Wuzzy

Allows you to get all items

Lush
rstcxk

fully featured shell interpreter

Schematic Editor
Wuzzy

Advanced tool for modders and advanced users to create and edit schematics.

BiomeDB
EmptyStar

Searchable biome database for robust biome selection

Blockwatcher
Cashia

Logs block edits and allows rollbacks for admins

QA-Block
bell07

A mods development / QA helper

Itemstring Viewer
Holly Mae

Displays full itemstring of a held item

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

An API for automatically registering recipes, nodes and ore generation.

Modding Commands
DragonWrangler

Adds Hopefully helpful commands for modding

player actions
Giga_M

shows the actions of a player

ASCII Art Schematics
Warr1024

Manage Minetest schematics as ASCII art.

Woolen Mesh Creator
entuland

Not only wool! Miniaturizes builds and allows rebuilding them too

Yourland Speak up
Sokomine

NPCs deliver speeches

Not actually the bare minimum base game
Sumi

Very little content base game so you can build off it. Totally permissive, you can relicense it or do whatever.

Test Harness
IRI

Provides an automated testing framework by simulating player behavior on a server. It allows developers to create, register, and run tests to their packages

typeof
TPH

Provides functionality similar to Luau's "typeof" function

m7a (API)
Mish7913

API Library

deploader
LuantistDork

Simple mod API that automates dependency-specific behaviour using a folder-heavy approach.

Ediblestuff API
lazerbeak12345

A unified API for making items, tools and armor edible. Eat armor while wearing it!

Key Combos
epCode

A lib for adding actions when certain keys are pressed in order.

Barrier
erov

Barriers with optional placement restrictions.

Pluggable Helpers
sorcerykid

Automated dependency management of helper functions within a distributed architecture

DeltaTime
SkyBuilder1717

Adds deltatime API

Stopwatch
sorcerykid

Stopwatch is Lua-based benchmarking API for developers

debuggery
fluxionary

debugging tools for server admins

Node entity library
The4spaceconstants

Library for functional node entities.

Quest Framework
TeTpaAka

Simple framework to define quests.

Minebase Core
ThatCommand

Adds APIs and new dynamic functionalities.

Simple notification wrapper
KirowL

This project offers a Notification System API to display temporary messages on the player's screen, allowing seamless integration of notifications into gameplay.

Lua Button
IlzumiZeminori

Button that executes custom lua code on rightclick

Runtime Strictness
LMD

Disallows questionable usage of the Lua API and Lua itself to help catch errors

Void - An empty game
Linuxdirk

The purpose of this game is to test mods in an absolutely “clean” environment with absolutely no “3rd-party” mods

Flow Inspector
Luke

An "inspect element" helper for flow GUIs