Chest Tools
Sokomine

Shared locked chests with bag support and quick inventory access

Notices
LandarVargan

Adds chatcommands server staff can use for announcements

Prejoin Messages
Gregon

Notifies players when a player starts connecting to the server

Auctions
Athozus

Adds ingame auctions

Verbana GUI
Luke

A GUI for verbana

2-Factor Authentication
sofar

Adds server and player email confirmation to add an extra layer of security (2FA)

YL Ticker
AliasAlreadyTaken

Displays messages once per timeframe

Chat Anticurse
lag01

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

Moth
iarbat

Adds moths which can send messages (from Lord of the Rings)

BabelFish Mail
1F616EMO

Translate mails into the player's preferred language

player actions
GigaByte

shows the actions of a player

Tips
1F616EMO

Send tips to newcomers

Antigrief
sorcerykid

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

Trading
ROllerozxa

Trade items with other players.

Serverguide
AiTechEye

The serverguide

Guilds
RisingLeaf

Adds a very basic guild system.

Offline Phantoms
Kimapr

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

Advanced Playtime
zanderdev

Keeps track of playtime for all players in your world. Notifies you how much playtime you have occasionally.

rPlace Analysis GUI
1F616EMO

Formspec GUI for rPlace Analysis

Envelopes
archfan7411

Write and address an envelope to another player!

Smart Chat
Clyde

A new, lightweight, simple and modular Chatsystem

YL Scheduler
AliasAlreadyTaken

Execute tasks based on utc

Chat3
octacian

Makes chat on a populated server much easier to understand and keep up with.

Nebula Anti-Cheat
JoinNebula

Cheat detection and prevention

Chat translate
ksandr

Adds commands to translate chat messages into the recipient's language.

Kick Player on Death/Respawn
Volik

Kicks player on death or respawn.

Smart Renting
AiTechEye

Smart renting: Rent out your locked things and earn money!

Protector Redux
sorcerykid

An efficient and flexible node-based protection scheme for multiplayer worlds

Keyring
louisroyer

Adds keyrings.

Babelfish Redo
1F616EMO

Translate chat messages into other languages

Customiserver
1faco

Adds colored chat and custom nametags

Extended Protection
1F616EMO

Extended interaction restriction rule

Autograph Mod
Jo5629_

Autograph Mod

Spawnarea
Casimir

Players spawn and respawn within an area around the center of active players.

@-Chat
orwell

Adds an alternative Private Message (PM) system

Blacklist Name
ANAND

Blacklist offensive names, forcing players to join with different names.

Caps Alert
ANAND

Catches chat messages with all-caps and warns / kicks players.

Minetest Teams
pl608

simple multiplayer team system

Random Messages
1F616EMO

Register random announcements

Boosts
activivan

Adds boosts, technically temporarily granted privileges.