Periodic Elements
ResendeTech

Adds the periodic elements

Chat Logger
Flay Krunegan

Allows players to view the last 100 chat messages, also allows you to search for keywords

Meseport
ForbiddenJ

Allows for the creation of Meseportation systems.

Flow Inspector
Luke

An "inspect element" helper for flow GUIs

Saw
Sofik5800

Saw that deleted from MultiCraft

Land Rush
BrandonReese

Chunk-based protection.

Filter
sofar

A chat filter for servers, to warn/kick/ban on swearing

Colored Chat (Server Side Mod)
1F616EMO

Color Your chat message

Quiz UI
snowyu

The Manager UI for the Quiz mod.

Runtime Strictness
LMD

Disallows questionable usage of the Lua API & Lua itself to help catch errors

HUD Title
Miniontoby

A HUD Title mod

limit_physics_monoids
fluxionary

overrides monoids controlling player physics provided by player_monoids, to limit how big they can grow.

Nebula Anti-Cheat
JoinNebula

Cheat detection and prevention

Kick voting
lag01

Allow players to vote to make life of selected griefers and especially agressive players harder.

Playtimes
Neuromancer

/playtimes command lets users see the playtimes & last login time for all users on the server

FediAuth
localhost

Verification/authorization via Fediverse based on (t)otp

Blobcats
Taurinechan

This mod spawn blobcats.

Spanish Phonics Learn to Read
Neuromancer

Learn how to sound out words and read in Spanish

Banned on Die
srifqi

Ban players upon death.

Drop Blacklisted
uyku

"Don't add the specified drop(s) to the inventory when digging"

Reportlist
Lejo

A Report System to manage player reporting use /reportlist to view reports

Scarlet
sorcerykid

Scarlet is a thin-wrapper library that simplifies the layout of formspec elements.

Proposals
Impulse

Adds proposing and voting on server changes

Ghost Snip (spectrum bow)
scorpiox8659

Add a bow named "Ghost Snip"

Msg Color
cj_clippy

Add colored chat messages to your server.

QA-Block
bell07

A mods development / QA helper

IRC Commands
ShadowNinja

Control your server from IRC

Player_join
Salzar

Adds a custom join and a left message.

AFK Protective Kick
1F616EMO

Kick AFK players facing dangers

Catcommands
mt-mods

adds some useful commands for servers

Death Timer
Coder12

This will force players to wait a specified amount of time on death.

Texture Generator
LMD

Dynamically generated texture packs

Cloud Storage
1F616EMO

Command-based Parcel Locker

Tsalagi_letters_modpack
yona

Tsalagi Letters

Lock Replicator
mazes

A tool to replicate locks

Insane crafting recipies
Arkatron

Adds special crafting recipies

Troll
niwla23

This adds a lot of commands to troll! Its ver WIP

Boring RPG
Lebedev

New items blocks and other pieces are waiting for you here

Treasurer
Wuzzy

A framework to define and distribute random treasures into the world.

use_texture_alpha workaround
1F616EMO

Fix boolean use_texture_alpha on MT5.9+