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

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.

Smart Vector Table
Noodlemire

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

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

Complete and Total Lua-Only Inventory Rewrite
Noodlemire

Creates a completely custom inventory system, which doesn't rely at all on any of the usual UserData objects.

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

Node Object
jwmhjwmh

A library for associating objects with nodes

Multiblock Lib
Mindcool25

Multiblock structure handler

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!

rcsv
Wuzzy

RFC-4180-compliant CSV parser and writer

ConfigFileLibrary
Tomlaus

A library that allows loading and saving data from config files.

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.