Rotting Wood
Polynium

Causes wood to slowly rot while exposed to water

Petards
IlzumiZeminori

Miscellaneous pyro things

TP Gate
AiTechEye

Teleport through the gate

BitChange
Krock

Money items for your world. You can mine bitcoins. Sort of.

Quarry Link
gabriel1379

Enables use of Quarry Mechanics with the stone-like and resource-nodes of other mods.

Vehicle Mash
Panquesito7

Adds many types of vehicles: cars, boats, hovercrafts and more.

Warning: Non-free media.

Leather Armor
X17

Adds an armor made of leather

Giftbox2
Wuzzy

Gift boxes that players can give to other who will then receive random items

What Did You Say??
AmericanHuston

Listens to what you say using python, and then causes things to happen in game!

My Torches
Don

Changes default torches to ones that burn out and cause damage

Dementia Mod
tommyaweosme

tries to simulate dementia in luanti

Fakery
iarbat

Adds counterfeit diamonds and other fake precious materials.

My Rocks
Don

Places rocks around the world

color_lib
bookgirl

adds HEX colouring

Poly Decor
mt-mods

My spin on decorative stuff.

Math blocks
Giulio

Adds decorative math blocks to help in teaching

Hardcorebrix
drkwv

Adds durable building materials that won't break on a first dig.

Shortcut
Derevio

Adds the ability to set shortcuts to commands.

Dye Mixer
LRV

This mod removes the mixes of dyes and the crafting recipes that allow you to dye wool and make them craftable in the Dye Mixer.

Advanced Keys
Lejo

Replaces the Skeleton Key with one with multiple chests.

ping
Giga_M

show your ping

Bloodmagic2
mt-mods

The successor to bloodmagic.

Element Exchange
enchant97

Exchange nodes into other nodes

Server Essentials
jolethen

An essential mod for any server

Keyring
louisroyer

Adds keyrings.

Colored Stone
Clyde

provides colored stones.

Telegram
neko259

Integration with telegram messenger chat

news
Giga_M

adds an editable news section when a player joins

nodeu
ulla

metal blocks stair railing coloured

Item exchange shop
Krock

Provides a simple exchange shop (currency compatible)

Tdl`s Staffs
tdldaboi

Adds elemental staves to the game.

Offline Phantoms
Kimapr

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

Random (Useful) stuff
pl608

A library that adds well... Random Stuff

Obelisk - Obelisk.jar [Inspired by lizardmeninc Obelisk]
colon

shhh it's here.

Ocular Networks
mt-mods

Draw power from the world, and use it to power machines and tools.

CSperson's Simple Pebbles
CSperson

A very simple mod that adds natural detritus. Doesn't do much besides that.

Bounty
csirolli

Place bounties on players

Trudged
Bas080

A simple mod that converts walked-over soil nodes to dirt.

Virtual Key
louisroyer

Adds virtual keys registerers.

Metatool
SX

Provides API to register node metadata tools along with few useful tools