Claymore
Giga_M

adds a powerful sword capable of deforming the ground

crouched
Giga_M

the player crouches

Boots of Swiftness Mod
ClothierEdward

Adds a new pair of boots called the Boots of Swiftness.

Climbing Pick
lag01

Tool to climb, double jump, and do good damage to mobs.

Good Sneaking
zempik10

Makes the player have better sneaking.

Molten Sailor by Dokimi
CalebJ

Boat for sailing on lava, suit for diving in lava.

Ocular Networks
mt-mods

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

Hbdrunk
UnchainedDevelopment

Adds intoxication effects and HUD bar to display intoxication level.

XP Highscores
debiankaios

Add a better highscore system for xp_redo.

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.

Death Coords
Niden

Show Death Coordinates

Darks
_Xenon

Adds dark stuff

Random (Useful) stuff
pl608

A library that adds well... Random Stuff

Kill history hud
Giga_M

adds a death history on the screen

Brights
_Xenon

Adds bright stuff