Dripstone
Noordstar

Add stalactites and stalagmites to your game.

Cave Generator
Noordstar

A custom cave generator engine

Moblib
LMD

Low-level high-performance entity library

breasy
Bas080

A mod that will tell you what the wind is like at a position.

Combine Slabs
X-DE

Allows you combine slabs

House Windows
DiamondPlane

Adds windows for your house

API Nodestages
AliasAlreadyTaken

An API for nodestages, which convert into other nodes

Object UUIDs
Silver Sandstone

Assigns a persistent UUID to every object.

Formspec Library
LMD

Formspec string builder & event handler callbacks

Attributes Effects
SFENCE

Provides API for various effects over attributes of players/mobs

Libox
frogTheSecond

A sandboxing library

Basic Ownership
sorcerykid

An efficient and flexible node-based protection scheme for multiplayer worlds

Unified API for in-game currency
1F616EMO

Unified API for currency management

Held Item Models & Animations API
TomCon

A powerful API adding in an easy system to integrate full 3d models when holding items.

Xmaps
erle

Adds map items that show terrain in HUD

Splooshy Bombs API
ekl

API for block-flinging bombs

Mobs Effects
SFENCE

Provides predefined attribute effects without apply logic for mobs based on Mobs Redo API, modifying movement, combat, and behavior attributes

Interchangeable Hands
octacian

Demonstration of Luanti's capability to dynamically change the player hand.

Item Help
Wuzzy

Adds automatically generated help texts for items.

Hitboxes Library
SFENCE

Provide functions for specify and recognize hit areas on entities/players.

Mesecons Stealthnode
Clyde

Register your own Ghoststones.

Kill Log
Wuzzy

Allows mods to display the recent player kills, deaths and other game events

Common Mob Interface
Byakuren

A standard modding interface for interacting with mobs

Lockout
ApolloX

Late-stage Security for Servers

Giad
ekl

WIP Library for creating walking vehicles

TPH's Doors API Redo
TPH

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

Loot
Byakuren

A loot framework.

TPH's Notenodes
TPH

Provides musically charged nodes for playing music - unique instruments + options

Player Visibility Api
erov

Easily manage player visibility in a similar way to area protection

monster_api_gb
Giga_M

add an api to create bosses

NucleoTest
DarkXWolf17

Battle Royale-like game. Provides an API and a reference implementation. Highly radioactive. Work in progress.

Simple Models
AntumDeluge

Very simple models.

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.

hand_monoid
fluxionary

player monoid for controlling the look and abilities of the player's hand.

Keyevent
DS

Adds an event for when player presses a key.

player attributes
fluxionary

API for defining abstract, compositional player attributes

Seasons Clock
solsword

API for getting various "season" parameters based on server time and a few customiable settings. Doesn't change gameplay; just a library that other mods can use to do seasonal things.

Node Damage
Noodlemire

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

Events API
TPH

API for creating, handling, and permitting function registration calls for custom events

Quest Framework
TeTpaAka

Simple framework to define quests.