CStrict
Logikí

This gives protection in chat from bad persons, from cursing & swearing

Messages Filter
Atlante

This mod allows you to filter the messages sent in order to maintain calm in your server.

Shortcut
Derevio

Adds the ability to set shortcuts to commands.

Chat Tools
theFox

chat commands that people might need

Notices
LandarVargan

Adds chatcommands server staff can use for announcements

Public Death Messages
Thresher

Adds toggleable and unique death messages for when a player dies

Server News
Thresher

Shows players the server news when they log in

filter++ lib
rstcxk

provides an API for filtering text

Chat2
lag01

Complements game built-in chat or replaces it.

Advanced Playtime
zanderdev

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

Matterbridge Player Events
cj_clippy

Sends a message to the matterbridge when a player joins/parts

Advanced Chat
LMD

A library for advanced chatting.

Pos Marker
1F616EMO

Add markers that can set and get via chatcommand.

Chat Anticurse
lag01

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

verbana
fluxionary

verification and banning

No Touch, Griefer!
ROllerozxa

Per-IP interact privilege bans

bug command
fluxionary

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

DoAs
Zemtzov7

Execute commands on behalf of another player

Blacklist Name
ANAND

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

filter++
rstcxk

censors swears in the player chat using the filter++ liberary

ping
GigaByte

show your ping

Clean Chat
MineTestDad

Parents wish to protect their children from possibly harmful words in chat. This allows them to maintain a list per player, which the parents in lieu of their children can extend by themselves.

player actions
GigaByte

shows the actions of a player

Chat Filter
xXNicoXx

Minetest Chat Filter a simple but usefull minetest chatfilter mod made by xXNicoXx

Player Status
Thresher

Allows you to set and get the in-game status of players

Voxelforge /sit and lay commands
VoxelForge

Sit and lay using chat commands

Seed of the World
Flay Krunegan

Show the seed of the world

Block / Unblock users
jesuistitus

The "Block / Unblock users" allows players to block and unblock messages from other players in the chat.

Time and Date Stamps
Bob64

This mod overrides the default chat format so that it also contains the date and time that the message was sent.

PlayerInfo
niwla23

Players can set their info and others can see it

OpenInv
Bapt-tech

A mod for admin to open inventories and ender chests in case of duplication (needs openinv and openec priv)