FS51
Luke

Compatibility layer for formspecs

name monoid
fluxionary

flexible control of a player's nametag

CentralAuth
1F616EMO

Player account unification across Luanti servers

Position listeners library
karamel

Players' position observing library

Level API
Hypernoot

A library for games to load levels defined as schematics

Chunk Version
Sumi

Stores the numerical version a chunk was generated, so that other mods may query this.

Old Wizard Font
Pyrollo

OldWizard font for Font API

Extended Protection
1F616EMO

Extended interaction restriction rule

MFSM Multiple Finite State Machine
Sumi

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

TPH's Basic Filesystem
TPH

API for loading files into a basic readable format as well as loading and converting conf files

Bedrock Markup Language
sorcerykid

Bedrock Markup Language is an extensible markup language and API for formspecs.

Phonics Library
Neuromancer

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

Dialogs
1F616EMO

Dialogs with options

Grenades API
LandarVargan

Adds an API for easily creating grenades

Advanced Breath and Health APIS
liteninglazer

Creates APIS to allow different players to heal health and allow different players to breathe different items.

Gettime
1F616EMO

A api to get in-game hour/minute

Local Time and Date Api
Bob64

Provides an API for other mods to use to get a user's preferred date and time format/time zone based on their configured settings

PostgreSQL Library
Tomlaus

Library for PostgreSQL Db.

Discord Bridge
Lesha_Vel

Mod + external program providing Discord relaying and commands. This is a fork of discordmt by archfan7411

filter++ lib
rstcxk

provides an API for filtering text

Chat Games API
Impulse

An API to build chatgames like those in the chatgames

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

YL Scheduler
AliasAlreadyTaken

Execute tasks based on utc

item_monoids
fluxionary

an API for controlling item properties via monoids

Wield Gadgets
1F616EMO

Register gadgets that can be used with a hotkey

Advanced Rangefinder
sorcerykid

Extends the API with search capabilities for entities

MQTT Client Library
Tuxilio

A mod for MQTT communication

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

Stopwatch
sorcerykid

Stopwatch is Lua-based benchmarking API for developers

toolcap_monoids
fluxionary

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

GroupLib
rudzik8

General grouping API

Random Messages
1F616EMO

Register random announcements

Telegram
neko259

Integration with telegram messenger chat

Item Tracking
Impulse

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

Minebase Core
ThatCommand

Adds APIs and new dynamic functionalities.

Isogen
BuckarooBanzai

Generate isometric images from ingame builds

verbana
fluxionary

verification and banning

Tips
1F616EMO

Send tips to newcomers

Advanced Forceload
Kimapr

a better forceloading API

Face Objects
1F616EMO

Calculate the facing of objects