WorldEdit
sfan5

In-game world editor. Use it to repair griefing, or just create awesome buildings in seconds.

Edit
Johannes Fritz

Allows copying, pasting, filling, deleting, replacing and saving 3D areas

Protector Redo
TenPlus1

Lets players craft special blocks to protect their builds or disable PVP in areas.

Meshport (Luanti Mesh Exporter)
random_geek

Easily export areas in Luanti to meshes for 3D rendering.

Modgen
BuckarooBanzai

mapgen mod creator

Terraform
x2048

Adds terraforming tools to your creative toolbox

Areas
ShadowNinja

Areas is a advanced area protection mod based on node_ownership.

Streetbuilder
seckl

Build a street from given points

Extruder Tool
fgaz

Adds an extruder tool that can extend continuous surfaces towards the node face that was clicked

WorldEdit Additions
Starbeamrainbowlabs

Extra tools and commands to extend WorldEdit. Currently has over 70 commands!

Cleaner
AntumDeluge

Remove/Replace unknown entities, nodes, & items.

Permatime
ROllerozxa

Set the day of time cycle to a certain time permanently.

Bulldozer
celeron55

Driveable bulldozer for pushing nodes and flattening ground

SzUtilPack
Warr1024

A collection of misc dependency-free utilities primarily for server hosts

Map Tools
Calinou

Adds various special versions of normal blocks, tools, and other map maintainer tools.

WorldEdit Maze Generator
wsor4035

A maze generator

Discord-Minetest Relay
archfan7411

Mod + external program providing Discord relaying and commands.

Really Flat
rdococ

Generates superflat terrain in whatever material you choose.

Playtime Recorder
Lejo

Use /playtime to get the time you played

Tools Using the Node Damage and Repair System
Noodlemire

Overrides pre-existing tools to make them cause persistent node damage.

Public teleport location bookmarks
Hybrid Dog

Add commands to manage public positions of interest

NextGen Bedrock
StarNinjas

Adds an indestructible bedrock layer at the bottom of the world.

Blockbomber Editor
MisterE

Make arenas for Blockbomber

Entity Modifier
j8r

Modify the model and size of entities, including players.

Essentials
SkyBuilder1717

Adds a lot of helpful commands for your server

Remove Unknowns
Clyde

A small tool to help you clean up your world of unknown-blocks.

Cozy Lights
SingleDigitIq

Early alpha. Improves the way light sources(torches etc) behave and allows to create huge lights, literal projectors with just a mouse click, light map will be computed for you.

MobConf
zeuner

Place, remove and configure Mobs (for now: NPCs) using chatcommands

Better Command Blocks
ThePython10110

Adds command blocks similar to those from a certain other voxel game.

Mapserver
BuckarooBanzai

mod for the mapserver

Internet Relay Chat
kaeza

Connect your server to an IRC channel, and install irc_commands to control the server from IRC

Classroom
rubenwardy

An easy way to manage students in-game, with support for bulk actions and macros.

use_texture_alpha workaround
1F616EMO

Fix boolean use_texture_alpha on MT5.9+

QA-Block
bell07

A mods development / QA helper

User Manager
1F616EMO

GUI to manage players

Moderator Warnings
1F616EMO

Emphasize warnings sent by the moderation team

WorldEdit Undo
Hybrid Dog

Undo and Redo executed WorldEdit chat commands

REJECT ALL PLAYERS
1F616EMO

Simply reject all login attempts and show them a message

Jean's Economy
Jean3219

Full Economy for Servers like, paying, individual bank statemants, daily rewards, easy api for modders, easy integration with other mods ...

Worldedit Big Schematics Handling
IRI

World Edit commands allowing to create and place large schematics, as well as maintain a command journal for undoing past actions.