Item Holders
Jose_ManuelS18

Adds 'Item Holders', blocks that hold your items in display, also provides a API.

Gigatools
jan Epiphany

Gigatools for gigachads with gigaworkloads.

Journal
theFox

Do you want to add story to your game? Make your protagonist write notes into his Journal.

Object UUIDs
Silver Sandstone

Assigns a persistent UUID to every object.

Doclib
joe7575

A library to generate ingame manuals based on markdown files.

Common Mob Interface
Byakuren

A standard modding interface for interacting with mobs

Giad
ekl

WIP Library for creating walking vehicles

NodeCore Staybs API
Winter94

Movement parameters for various 'staybs'

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

Function Delayer
Hybrid Dog

Allows executing functions after a delay to reduce possible lag (EDD scheduler?)

Simple Models
AntumDeluge

Very simple models.

Central Message
Wuzzy

Simple API to show messages to the center of the screen to players.

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.

player attributes
fluxionary

API for defining abstract, compositional player attributes

Minetest test framework
BuckarooBanzai

Provides an api to register test functions for integration-tests.

CSMT Bots (Obsolete)
Logikí

Add bots to your game for training

TPH's Doors API Redo
TPH

(INTENDED FOR DEVELOPERS) Attempts to ease and better simplify door mechanics + registration

Lush
rstcxk

fully featured shell interpreter

Chatcommand Library
LMD

Library for registering chatcommands.

Ediblestuff API
lazerbeak12345

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

Template to Easily Make Fancy Voxelized Models
Noodlemire

Provides voxelmodel.obj, a model designed to be shaped by changing its texture, in order to easily create fancy voxelized models.

Loot
Byakuren

A loot framework.

HUD FS
Luke

A library to make HUDs from formspecs

Antigrief
sorcerykid

An API for validating node and item placement via a simple callback mechanism.

Vision Lib
mt-mods

Common library for PolySaken's mods.

Unified Stamina API
TestificateMods

Provides a universal API for handling different mods that provide a stamina bar

Job Control Mod
sorcerykid

A more flexible alternative to the builtin minetest.after function

Smart Chat
Clyde

A new, lightweight, simple and modular Chatsystem

Node Damage
Noodlemire

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

flinv
Luke

API to add new inventory tabs which work across different inventory mods

Weapons API
Stix

Adds an API to easily register custom weapons

Minetest Teams
pl608

simple multiplayer team system

Anti Exploit
LMD

Protects against exploits

Signs Redux
sorcerykid

Signs Redux is a complete rewrite of default signs that adds many new features

Echo
1F616EMO

In-game notification system

GetName
kevins

Adds an API and tool to generate random names for NPCs, mobs, and places.

Old Wizard Font
Pyrollo

OldWizard font minetest mod for font API

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

Squill
Luke

A subset of SQL. No complex installation required.