Invisible Blocks
Truemmerer

Add invisible Blocks

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

Dirt Tunneler
Neuromancer

Makes dirt deeper and you can tunnel through it just by walking through it. Press spacebar/shift to tunnel upward/downward with auto placed ladders.

Skates
Vasiliy

A simple ice skating.

Livetools
AiTechEye

Craft tools which have a life of their own - they can fight, dig, or place for you

Smart Renting
AiTechEye

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

nodeu
ulla

metal blocks stair railing coloured

TurtleMiner
BirgitLachner

A Mod to let Kids start programming with a turtle that can move around in the world, and dig and build what the user wants.

Coins
Clyde

Adds 3 kind of Coins to your game

My Item Chest
Don

A chest that spawns different items

More Ladders
SkyBuilder1717

Adds more ladders and sticks!!!

Hbdrunk
UnchainedDevelopment

Adds intoxication effects and HUD bar to display intoxication level.

Better Roads
DragonWrangler

allows players to make roads with less jagged edges

BitChange
Krock

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

My Flooring
Don

A basic set of flooring

Uncrafter
JoeEnderman

Adds an uncrafting table

Sneeker
AntumDeluge

An explosive nuisance.

Protector Redux
sorcerykid

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

Item exchange shop
Krock

Provides a simple exchange shop (currency compatible)

Technic Transporter
Fruitsnack

Mod that adds a technic-powered HV transporter

S Potions
Stakbox

Adds a simple potion brewing system for MTG. Includes API for adding custom potions.

rtp
bookgirl

Random teleport commands (/rtp and /wild)

Offline Phantoms
Kimapr

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

LDF Race And Parkour
lister

Race/Parkour Timers and Record Tables

Frames
opfromthestart

Frames from Technic since it was removed.

Realm Lamp
GenesisMT

A rainbow gradient block for decoration and with differents speeds.

Leather Armor
X17

Adds an armor made of leather

Multitool Mod
thediamondlego

Adds a new tool that does the job of all the other tools(except hoe and screwdriver). Also has bouble the durability of a diamond tool!

My Lava Sponge
Don

Soaks up lava

Random (Useful) stuff
pl608

A library that adds well... Random Stuff

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.

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

doorbell
Miniontoby

A doorbell mod with sound

3D Spikes
Groin

Adds spikes to the game.

Throwable Snowball
ComputeGraphics

Adds a throwable Snowball

Tac Nayn
GreenXenith

Adds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).

Subway Tracksides
GWLT

Add tracksides for your subway map.

bridgemaker
mike.monkeybiter

A refillable machine to easily create simple block bridges across caverns and valleys.

Top players
Giga_M

Adds a kill, deaths, and kd counter to players.