Ediblestuff API
lazerbeak12345

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

Tasks Framework
AntumDeluge

Framework for adding tasks & quests.

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Sway
lazerbeak12345

A simple inventory that makes use of Flow forms.

TPH's Doors API Redo
TPH

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

Player Settings
1F616EMO

Player-specific settings

Interchangeable Hands
octacian

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

Item Holders
Jose_ManuelS18

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

Quest Framework
TeTpaAka

Simple framework to define quests.

GetName
kevins

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

hand_monoid
fluxionary

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

Player Visibility Api
erov

Easily manage player visibility in a similar way to area protection

Pillars
citorva

Add a lot of pillars for fun.

CSMT Bots (Obsolete)
Logikí

Add bots to your game for training

Smart Chat
Clyde

A new, lightweight, simple and modular Chatsystem

NodeCore Crystals
Winter94

Adds various crystal types to Nodecore

status effects
fluxionary

api for defining player status effects

Loot
Byakuren

A loot framework.

Kill Log
Wuzzy

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

NameGen
cronvel

Name generator API.

Keyevent
DS

Adds an event for when player presses a key.

NodeCore Staybs API
Winter94

Movement parameters for various 'staybs'

NucleoTest
DarkXWolf17

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

Inventory Change Callback
luarocks

Provide a global callback for handling player inventory changes.

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

Minetest HTTP API QoS control queue
SX

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

Archipelago Library
Warr1024

Archipelago multi-world randomizer integration library

Unified Stamina API
TestificateMods

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

FS51
Luke

Compatibility layer for formspecs

Function Delayer
Hybrid Dog

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

Weapons API
Stix

Adds an API to easily register custom weapons

Advanced Rangefinder
sorcerykid

Extends the API with search capabilities for entities

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

timehud
bookgirl

Minimal HUD timer API

afk_api
fluxionary

an API for registering events which trigger when a player goes AFK or comes back from AFK.

Players Effects
SFENCE

Provides predefined attribute effects for players ncluding movement, vision, and brain concussion effects. Apply logic is not included.

Scripted World Editor
Neuromancer

API that allows you pass in scripting tables to fill a series of shapes of different sizes with different nodes

Guider
1F616EMO

HUD markers for navigation

action queues
fluxionary

provides an API for queuing things for batch processing w/ various ways to specify the batch "size".

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.