NPC you can talk to (in combination with yl_speak_up)
Sokomine

Adds actual NPCs to yl_speak_up

Extended Tooltips: Food
adikalon

Adds food information

Ingame Editor for Yourland Speak up mod
Sokomine

Edit ingame what NPCs say without server restart

Encyclopedia
Wuzzy

Adds an encyclopedia item which allows you to access the help.

Basic Help
Wuzzy

Adds some help texts explaining how to use Luanti.

sfinv++
swagtoy

Improves the inventory, and fixes some formspecs throughout some mods.

Mesecons Lab Cursor
NameNotQuality

The cursor from Mesecons Lab

Item Help
Wuzzy

Adds automatically generated help texts for items.

inventory ores
fluxionary

shows where to find ores in an inventory manager.

Modname Tooltip (Non-mcl)
QuillNewelt

Tooltip that shows you what mod a node or item is from

Safe Chest
Atlante

Add a safe chest with secret password

Personal Bookmarks
AntumDeluge

Allows players to create a limited number of personal bookmarks to where they can teleport.

Formspec Library
LMD

Formspec string builder & event handler callbacks

WorldEdit Wall Block
SkyBuilder1717

Adds block and item for making big structures easily as possible.

flinv
Luke

API to add new inventory tabs which work across different inventory mods

Pixel Fonts
luarocks

Install or uninstall pixel fonts.

Server Factions
Calice

Adding factions interfaces !

Journal
theFox

Do you want to add story to your game? Make your protagonist write notes into his Journal.

Item Information
Flay Krunegan

Shows information about the item in use.

Colored Chat Text
Bob64

This makes the minetest chat messages a different color depending on what you set it to in the settings.

Go
LMD

A game of Go

Uncrafter
JoeEnderman

Adds an uncrafting table

Bedrock Markup Language
sorcerykid

Bedrock Markup Language is an extensible markup language and API for formspecs.

XP Highscores
debiankaios

Add a better highscore system for xp_redo.

Sway
lazerbeak12345

A simple inventory that makes use of Flow forms.

Chatcommand Library
LMD

Library for registering chatcommands.

MT POI Map
beaver700nh

Displays a map with points of interest, for any game (no dependencies).

Chat Guide
Ludus

A virtual assistant that helps players with tips, guides, and useful information.

Markdown Poster
Thresher

Adds a markdown variant to the signs mod (from display modpack)

Montserrat ESR Font
EmptyStar

A fresh and comfortable font remix made for Luanti

FS51
Luke

Compatibility layer for formspecs

Nebula Admin
JoinNebula

In-game administrator control panel/dashboard/configuration editor

InvManager
IlzumiZeminori

Allows to check and remove items from players' inventories

Kill Button
niwla23

Allows you to kill yourself from the UI

ReSpec
ZenonSeth

Easy and Versatile Formspec Creation based on ConstraintLayout

Pencil Redo
1F616EMO

Tool to edit infotext of nodes

MineTest FileManager (MTFM)
IlzumiZeminori

Formspec-based file manager with text editor and image viewer

Moth
iarbat

Adds moths which can send messages (from Lord of the Rings)

news
GigaByte

adds an editable news section when a player joins

Flow Extras
lazerbeak12345

An experimental collection of extra widget APIs for flow