This should be make sense!
1F616EMO

Adds missing crafting recipes that should exist

AFK Kick (AFK Indicator)
1F616EMO

Kick inactive players

IRC Commands
ShadowNinja

Control your server from IRC

Riddance
Blockhead

Hide or rid yourself of unnecessary items from games and mods without any code

Chat Anticurse
lag01

Kick player out when they type a curse word in chat or using /me or /msg command.

Tips
1F616EMO

Send tips to newcomers

Localized Server News
ronoaldo

Display localized server news when a player joins

Minetest HTTP API QoS control queue
SX

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

toolcap_monoids
fluxionary

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

Kill Button
niwla23

Allows you to kill yourself from the UI

status effects
fluxionary

api for defining player status effects

verbana
fluxionary

verification and banning

Japanese Name
Logikí

transform your player name to japaNESE (joke)

Dialog Redo
1F616EMO

Flexable dialog API

B.W Protection
Logikí

This gives API for bad words detection

SmartFS
rubenwardy

A library to allow mods to make Formspecs, a form of GUI, easily.

Offline Phantoms
Kimapr

Players leave "phantoms" when leaving; other players can take items from those

Server Lockdown
1F616EMO

Keep non-admin players away during maintainence

Tool Watcher
j0j0n4th4n

Introduces an item for monitoring the wield tool durability and alerting players when their equipment is close to breaking through a HUD text.

Stent
AFCM

A formspec based arena entrance type for arena_lib

balanced diet
fluxionary

api for specifying multiple dimensions to eating

Shadowmute
wsor4035

allows muting and shadow muting players

node entity queue
fluxionary

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

Squill
Luke

A subset of SQL. No complex installation required.

No Touch, Griefer!
ROllerozxa

Per-IP interact privilege bans

Advanced Ban
srifqi

Advanced Ban: Ban a player based on its username

NC Pumbob
Winter94

adds carvable and sealable pumice bobbers/floaters

Modpol
ntnsndr

Framework that enables diverse governance processes

Node Placer Saving
1F616EMO

Put node placer data into the node

Wield Gadgets
1F616EMO

Register gadgets that can be used with a hotkey

Click Speed Detector
Tomlaus

A mod that ensures you can only place a node every 0.16 seconds. It is intended for servers to counter players using auto-clickers.

aSignals
Sumi

Signal event bus API including SIGNAL, LISTEN and CONDITIONAL functions

bug command
fluxionary

adds a command that submits a bug report to a github repo.

TransCryptor
Flay Krunegan

Text to Binary, Binary to Text, Text to Morse, Morse to Text, Binary to Morse, Morse to Binary.

AoM Settings
Sumi

Provides methods for both player level and server level settings

Callbacks API
ANAND

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

Random API
TheFanne

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

DoAs
Zemtzov7

Execute commands on behalf of another player

ConfigFileLibrary
Tomlaus

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

Guilds
RisingLeaf

Adds a very basic guild system.