HUD bars
Wuzzy

Replaces the default health and breath symbols by horizontal colored bars with text showing the number. Extensible.

Playerlist
Fleckenstein

Show a list of all online players (similar to minecrafts tab-list) when a player is sneaking.

Mineclone2 Spyglass
NO11

This adds a spyglass, which is an item that can be used for zooming in on specific locations.

Witt 2(What Is This Thing)
pevernow

Witt can display the name, source module and details of the target that any player points to.

Mudsling
Avicennia_g

Inverted-direction player slingshot

Hunger with HUD bar
Wuzzy

This mod adds a simple hunger mechanic (plus HUD bar) to the game. Eat food to avoid starvation, be sated to regenerate health.

HUD Compass
kestral

Optionally place a HUD compass and 24-hour clock on the screen.

Armor HUD bar
Wuzzy

Adds a HUD bar displaying the current damage of the player's armor.

Hunger NG
Linuxdirk

Hunger NG is a mod for Minetest adding a very customizable and easy to extend hunger system.

HUD Timers
LMD

A lightweight library for adding hud timers.

WorldEdit HUD Helper
Starbeamrainbowlabs

Displays the name of the node you're looking at & your rotation in your HUD. Banish the debug text forever!

Inventory Icon
Wuzzy

Shows a backpack icon in the HUD, which shows how many slots are available and free in the player inventory and equipped bags (if available).

MineClone2 Welcome HUD
AFCM

Show welcome bossbar in the HUD

Minimap Radar
OgelGames

A simple mod that enables the use of the minimap radar with a craftable item

mTimer
Linuxdirk

Ingame timer for showing current playtime, current day time, ingame time, etc.

MoreInfo
nixnoxus

Adds various infomation

Kill History
LMD

Adds a kill history

advmarkers
luk3yx

Allows you to create and manage markers/waypoints.

Basic HUD textures
Wuzzy

Adds basic but neccessary HUD images: Heart icon, bubble icon, … (for game authors)

Complete and Total Lua-Only Inventory Rewrite
Noodlemire

Creates a completely custom inventory system, which doesn't rely at all on any of the usual UserData objects.

Time, Lag and Position HUD display
orwell

Displays some information in the bottom-right corner of the screen.

WiTT
MightyAlex200

Small indicator to show what the player is looking at.

HUD Notify
ANAND

Shows a message to a player in-game, by means of an HUD element.

Inotify
ApolloX

A notification tool for players in-game.

HUD Title
Miniontoby

A HUD Title mod