ColorBrewer palettes for cartography
pauldpickell

8-bit ColorBrewer palettes texture pack

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

Blood Bane Sword
Blocky Player

OP sword for moderators. In memory of an old teacher, who had a mod similar to this on a private server.

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.

Player IP Log
simondanerd

Mod for any game which logs what users join, and records their IP address. Content saved as a txt file in the worlds directory.

Persistent Effects
epCode

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

Plasterwork
Sokomine

Add colored plaster coats to nodes

Macro Crafting Manager
sorcerykid

Macro Crafting Manager provides a streamlined drag-and-drop interface for dividing and arranging item stacks within the craft-grid

TNTTag
debiankaios

A player is holding TNT which is about to explode; they must tag other players to get rid of it

Hardcorebrix
drkwv

Adds durable building materials that won't break on a first dig.

PerfHUD
Juri

Adds an HUD which shows some performance stats.

Minetest Systemd (API)
Piezo_

Debugging utility and compatibility tools for server owners and/or modpack creators

Place Rotated
12Me21

Better slab/log placement

Item Holders
Jose_ManuelS18

Adds 'Item Holders', blocks that hold your items in display, also provides a API.

item_monoids
fluxionary

an API for controlling item properties via monoids

Markers
Sokomine

Easy interface (GUI) for the areas/advanced_areas protection mod

Sugar
X17

Adds eatable sugar made of papyrus and a sugar block

World of Life
LMD

Simulates 3D cellular automata in your entire world. WARNING: you will lose items & buildings in your world.

faction items
GigaByte

add some items to be used as prizes for special events or player achievements

Blink
0siribix

Short distance teleport

Item exchange shop
Krock

Provides a simple exchange shop (currency compatible)

What are those!?
tacotexmex

See what those nodes are called by simply looking at them (or by punching them)

Nodeternal Darkness
Kimapr

make nodecore very dark

Great British Pound
angry_hd1

Adds A Simple Currency System

Tile Floors
ClassicAdam

Various colors of tile flooring in 16px and 256px res

Public Death Messages
Thresher

Adds toggleable and unique death messages for when a player dies

Dirty Shovels
SmokeyDope

Give shovels the ability to turn paths back to dirt on right-click.

Colored Leaves
Otto

Adds several colors of leaves

Auth Redux
sorcerykid

Auth Redux is a drop-in replacement for the builtin authentication handler of Minetest

Chat Tools
theFox

chat commands that people might need

Voxelizer
LMD

Turns 3D models into astonishing voxel builds.

Crucifix
nurd3

Adds a crucifix to insta-kill anything

2-Factor Authentication
sofar

Adds server and player email confirmation to add an extra layer of security (2FA)

MoreInfo
nixnoxus

Adds various infomation

Function Delayer
Hybrid Dog

Allows executing functions after a delay to reduce possible lag (EDD scheduler?)

Instabreak
Mint

Instantly break (most) construction blocks.

Temporary Passwords
1F616EMO

Assign temporary passwords to accounts

Lightdead
niwla23

Spawns a lightning over the dedposition of a player when he dies

Inventory Overflow
monk

If main is full, place nodes into the next available inventory

money3
Luke

Adds /money.