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.

Markdown Poster
Thresher

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

Advanced Rangefinder
sorcerykid

Extends the Minetest API with search capabilities for entities

Chair lift
SFENCE

Add craftable and usable chair lift. TIPS: Use gearbox, grease parts (hemp oil), check grease with inspect tool, combine more engines...

Rivets
Silver Sandstone

Adds rivets for decoration or locking blocks.

Euthamia
Avicennia_g

Grassy Goldenrod plant for Nodecore

Autobox
Just_Visiting

Auto Collision/Selection Loading Boxes

Fareboxes and Faregates
1F616EMO

Signal-emitting fareboxes and faregates

Lavaplop
DS

Makes lava plop every now and then

hexcol color picker
Mjokfox

color picker for hexcol

Static compass
Sokomine

Compass block that can be placed and shows you where north is.

Cooksneak
Kimapr

Smarter furnace shift+click behavior

Petards
Zemtzov7

Miscellaneous pyro things

Simple Tape Measure
OgelGames

Adds a simple tape measure.

Riddance
Blockhead

Hide or rid yourself of unnecessary items from games and mods without any code

Nextgen Compass
StarNinjas

A compass item which points towards the world origin.

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.

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

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