Kill history hud
GigaByte

adds a death history on the screen

superspeed
GigaByte

change the player's speed x10

HL Marker
Flay Krunegan

Teleportation Marker is a unique item that allows players to set and execute teleportation to marked positions with customizable delay times.

Simple Commands
enchant97

Adds simple chat commands

Player Nametags
LMD

Adds player nametags floating above players.

Ediblestuff API
lazerbeak12345

A unified API for making items, tools and armor edible. Eat armor while wearing it!

Boulder Dig
Neuromancer

Creates gameplay for the game Boulder Dig (inspired by Boulder Dash). Find the boulders and gems scattered throughout the regularly generated world. 2nd option is more densely packed levels.

Bunny Hop
Flay Krunegan

Allows players to move faster using a key combination

PvP Control
mike.monkeybiter

Allow players to set their own ability to hurt or be hurt in PvP, by chat command or by pressure pads. Nametag colour changes to reflect status.

Death Coords
Niden

Show Death Coordinates

NodeCore 1 slot mod
Fanticwor

makes Nodecore 8 times harder by removing 7 slots from your inventory

Ocular Networks
mt-mods

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

Limited Lives
Xenon

Limits the times players can die.

Upgrades
niwla23

Adds effects to players for a short time

Darks
_Xenon

Adds dark stuff

Brights
_Xenon

Adds bright stuff

Random (Useful) stuff
pl608

A library that adds well... Random Stuff

status effects
fluxionary

api for defining player status effects

Speed Manipulation
Volik

Change your speed!

Persistent Effects
epCode

An API for creating persistent effects for any object. eg. damage a player or entity over time. (like poison)

XP Highscores
debiankaios

Add a better highscore system for xp_redo.

Antipyre
Warr1024

Safety net against falling off your island

Knockback
LandarVargan

Adds knockback for pre-5.1 Minetest clients without using entities

Minefall
Astrobe

Fight, farm, explore, build. Solo or multiplayer.

Hide Name
AntumDeluge

Hide nametag from view.