persistent_monoids
fluxionary

player_monoids that persist between player sessions and server restarts/crashes.

Dialogs
1F616EMO

Dialogs with options

Lockout
ApolloX

Late-stage Security for Servers

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Persistent Effects
epCode

An API for creating persistent effects for any object. eg. damage a player or entity over time. (like poison)

Grenades API
LandarVargan

Adds an API for easily creating grenades

Timed World Modifiers library
karamel

Environmental ABM that could be triggered on a very wide range of nodes but only a few at a time.

Simple Models
AntumDeluge

Very simple models.

Nametags2
Logikí

Allow objects had nametags with observers, colors and range

Node Damage
Noodlemire

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

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Quest Framework
TeTpaAka

Simple framework to define quests.

Minetest test framework
BuckarooBanzai

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

name monoid
fluxionary

flexible control of a player's nametag

Timekeeper
sorcerykid

Timekeeper acts as a centralized dispatcher for all time-sensitive routines

NameGen
cronvel

Name generator API.

MFSM Multiple Finite State Machine
Sumi

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

Node entity library
The4spaceconstants

Library for functional node entities.

Item Tracking
Impulse

Provides a API to mod developers to track which inventories items are in.

Events API
TPH

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

More vector helpers
Hybrid Dog

Adds more vector functions.

Weapons API
Stix

Adds an API to easily register custom weapons

Compression Lib
The4spaceconstants

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

Virt
frogTheSecond

A library for (qemu) virtual machines

Loot
Byakuren

A loot framework.

Interactive Item API
Jose_ManuelS18

Provides an API to make it easier to implement items' inner workings.

Function Delayer
Hybrid Dog

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

Smart Vector Table
Noodlemire

API that adds a way to create tables indexed by 3D Vectors.

Wield Events
mt-mods

Events for wield item switching

action queues
fluxionary

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

Antigrief
sorcerykid

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

Position listeners library
karamel

Players' position observing library

LCD Font
Nazalassa

A simple font for font_api

Minetest Teams
pl608

simple multiplayer team system

Signs Redux
sorcerykid

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

Scripted World Editor
Neuromancer

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

Autobox
Just_Visiting

Auto Collision/Selection Loading Boxes

Flow Extras
lazerbeak12345

An experimental collection of extra widget APIs for flow

Minebase Core
ThatCommand

Adds APIs and new dynamic functionalities.

Anti Exploit
LMD

Protects against exploits