Inotify
ApolloX

A notification tool for players in-game.

Fly-B-Gone!
Hugues Ross

Hides butterflies/fireflies

Hitchhiker's Guide to the Galaxy
Paul Wilde

A bunch of nodes that do some things related to Hitchiker's Guide to the Galaxy

My Mulch
Don

Turns leaves and other items to mulch blocks

Coord Hud
ergolyam

Per-player HUD showing current coordinates with draggable sliders to set position and size.

Archipelago for Citadel
Warr1024

Connect Citadel to Archipelago Multi-world Randomizer

Ptracker
Jo5629_

Track a friend or an enemy with this item.

3d Random Walk Blocks
chaosomnium

3d Random Walker Blocks that create interesting structures in the world

Beerchat
mt-mods

standalone chat channel mod

Plastic Box
Starbeamrainbowlabs

Adds a recolourable plastic box. Fork of @cheapie's version with improvements.

Minetest Engine Stats
mtvisitor

Get some basic stats of Luanti (>= ver5.8)

MathPlot
kyleclaassen

A tool for constructing mathematical curves/surfaces/solids.

Entities Protection
Impulse

Protects entities from attack in protected areas

PerfHUD
Juri

Adds an HUD which shows some performance stats.

Dialog Redo
1F616EMO

Flexable dialog API

AFK Kick (AFK Indicator)
1F616EMO

Kick inactive players

Phonics Library
Neuromancer

Provides a library for creating Phonics (Learn how to read) mods in different languages.

Personal Log
FaceDeer

A personal log where players can track events and places

Purple ore
X-DE

Adds new purple ore to floating islands and caves from height 200 to 31000.

Public Death Messages
Thresher

Adds toggleable and unique death messages for when a player dies

Math blocks
Giulio

Adds decorative math blocks to help in teaching

Quarry Link
gabriel1379

Enables use of Quarry Mechanics with the stone-like and resource-nodes of other mods.

Shop Dialog
1F616EMO

Formspec-based shop dialog

Knapping Mechanics
csirolli

Adds knapping mechanics API inspired by Vintage story

Server Cleaner
AiTechEye

Keep the server clean and simple

Beautiful Boulders
regulus

Procedurally Generated Rocks with (pretty) Accurate Collision Boxes

Pineapple
Neuromancer

Pineapple crop for tropical biomes

Minetest Teams
pl608

simple multiplayer team system

craftsystem
fluxionary

craft registration API which automatically deals w/ replacements

Nodecore Dye
Crystal Heart

Dyes & painting for Nodecore.

Colored Stone
Clyde

provides colored stones.

Goxel Tools
MisterE

Allows using goxel to create Luanti builds. Saves a palette of node colors for import into Goxel and allows importing Goxel models made using said palette.

Skyhell Together
Kimapr

Put all skyhell players on one shared island (NodeCore)

Pink Lava
TenPlus1

Adds pink lava to certain depth of map with new mahogany obsidian block

Tips
1F616EMO

Send tips to newcomers

Get Biome Data
ROllerozxa

Get biome data from core.get_biome_data

Wield Events
mt-mods

Events for wield item switching

Colored Strings
Alib234

Adds colored strings and allows to create wool from 4 strings and viceversa

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.

Legendary Ore
DynamaxPikachu

Adds legendary ore and blocks