Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Minetest HTTP API QoS control queue
SX

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

NodeCore Crystals
Winter94

Adds various crystal types to Nodecore

toolcap_monoids
fluxionary

an API to allow multiple sources to apply changes to a tools's capabilities.

Entity Control Function Library
Noodlemire

Adds functions to override and unregister entities.

Archipelago Library
Warr1024

Archipelago multi-world randomizer integration library

Natural Entities
LuantistDork

A lightweight API for spawning random entities

Matrix Chat
joenas

This mod creates a bridge between a Matrix channel and the in-game chat!

deploader
LuantistDork

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

FS51
Luke

Compatibility layer for formspecs

rcsv
Wuzzy

RFC-4180-compliant CSV parser and writer

Chatcommand Library
LMD

Library for registering chatcommands.

Database Manager
AFCM

Database Manager API

More Triggers
SkyBuilder1717

Adds more triggers for Awards

Sway
lazerbeak12345

A simple inventory that makes use of Flow forms.

Register, Attach & Detach
mzel1982

Register glowing 3D items and custom display nodes that you can easily attach to players, place on walls, or showcase on pedestals.

YALib
hutzdog

Yet Another Library

Doclib
joe7575

A library to generate ingame manuals based on markdown files.

aSignals
Sumi

Signal event bus API including SIGNAL, LISTEN and CONDITIONAL functions

item_monoids
fluxionary

an API for controlling item properties via monoids

Compression Lib
The4spaceconstants

A library that provides functions to procedurally register compressed versions of nodes.

DataMiner
sorcerykid

DataMiner is an analytical tool for server operators with a feature-rich API for customized report generation

Isogen
BuckarooBanzai

Generate isometric images from ingame builds

Unified Stamina API
TestificateMods

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

Phonics Library
Neuromancer

Provides a library for creating Phonics (Learn how to read) mods in different languages.

Node Damage
Noodlemire

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

Quest Framework
TeTpaAka

Simple framework to define quests.

PostgreSQL Library
Tomlaus

Library for PostgreSQL Db.

More vector helpers
Hybrid Dog

Adds more vector functions.

Face Objects
1F616EMO

Calculate the facing of objects

Tasks Framework
AntumDeluge

Framework for adding tasks & quests.

MFSM Multiple Finite State Machine
Sumi

Allows for multple states to be active, while maintaining typical state machine behavior. Good for gamestate and mobs.

Star
Wiz

A* Pathfinding algorithm implementation

LCD Font
Nazalassa

A simple font for font_api

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Advanced Forceload
Kimapr

a better forceloading API

Job Control Mod
sorcerykid

A more flexible alternative to the builtin minetest.after function

is_even
Sumi

Searches for whether an integer is even or odd. (satire)

Lockout
ApolloX

Late-stage Security for Servers

verbana
fluxionary

verification and banning