node entity queue
fluxionary

a queue for spreading out the generation of node entities over multiple server steps (smartshops, signs, itemframes, etc).

mcl_apocalypse
Furious_mat

challenge mod for Mineclone

Roulette Table
LiyahMackenzie

Adds a roulette minigame with a table block, to gamble away your possessions.

GroupLib
rudzik8

General grouping API

Quikbild
MisterE

quikbild Minigame

Server News
Shara

Show server news when players join

Virtual Key
louisroyer

Adds virtual keys registerers.

Coord Hud
ergolyam

Per-player HUD showing current coordinates with draggable sliders to set position and size.

Build Mangle (Joke only)
RasPiManiac

Type /destroy to mangle a build :P

Tune JIT
rudzik8

Tunes LuaJIT parameters to improve server performance by preventing constant GC

Timekeeper
sorcerykid

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

treasures
ademant

Treasure nodes with useful items

Database Manager
AFCM

Database Manager API

BigNum
ThePython10110

A library that adds a data type for arbitrary precision integers

Lockbox
Jo5629_

Library for cryptography/encryption functions.

YALib
hutzdog

Yet Another Library

Grimoire
monk

Override tool functionality during runtime

Inotify
ApolloX

A notification tool for players in-game.

Detailed Features
Holly Mae

Lets you see detailed info on specific mods

Towny
livphi

Town based protection system

description_monoids
fluxionary

API to allow multiple mods to make modifications to an itemstack's description

Localized Server News
ronoaldo

Display localized server news when a player joins

Phonograph Album: Diarmuid's Soundtracks
1F616EMO

Songs composed by Diarmuid

Kill Button
niwla23

Allows you to kill yourself from the UI

Fly-B-Gone!
Hugues Ross

Hides butterflies/fireflies

Place Node Command
1F616EMO

Add `setblock` and `place` command

Simple Dice
farfadet46

Simple dice for little games ;)

aSignals
Sumi

Signal event bus API including SIGNAL, LISTEN and CONDITIONAL functions

Advanced Chat
LMD

A library for advanced chatting.

PerfHUD
Juri

Adds an HUD which shows some performance stats.

Random API
TheFanne

Provides a simple-to-use framework for selecting random objects with probabilities

Fakery
iarbat

Adds counterfeit diamonds and other fake precious materials.

Callbacks API
ANAND

callbacks_api is a framework for registering callbacks if the callback registration function exists, else returns gracefully.

rPlace Analysis GUI
1F616EMO

Formspec GUI for rPlace Analysis

toolcap_monoids
fluxionary

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

elysium
GigaByte

add a elysium command

Goxel Tools
MisterE

Allows using goxel to create Luanti builds. Saves a palette of node colors for import into Goxel and allows importing Goxel models made using said palette.

FS51
Luke

Compatibility layer for formspecs

Minetest Teams
pl608

simple multiplayer team system

ConfigFileLibrary
Tomlaus

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