Zero-Effort Custom Minerals
Piezo_

A tool for registering entire materials, complete with ore generation, tool-sets and automatically generated sprites with almost no effort required

Hardcore mode
SkyBuilder1717

Adds a hardcore mode.

Clay Bricks
AwesomeDragon97

Adds colorful clay bricks.

Oxidizing Copper
StarNinjas

This mod aims to make copper/bronze more realistic by making them slowly oxidize into a bluish/green block when exposed to water.

Nettles and Other Weeds
Hume2

Nettles spawning on junky plots

Bonified
Shqug

New features related to the bones you get from dead players in MTG.

More Pickaxes
Koda_

Adds additional pickaxes to the game

block physics
GigaByte

Add pieces of broken blocks when breaking them.

Procedural Furniture
the_raven_262

Creates furniture collections

potal launcher
Soundwavez

Potal Launcher

Music Player
Jose_ManuelS18

Adds a music player and discs

HUD Analogic Clock
APercy

Adds an analogic clock to hud

Metallicum
Ludus

The power of titanium

3d ores!
Soundwavez

a slick new take on the default ores!

Rain Barrels and Wells
Piezo_

Replaces overpowered "water generators" with a unique water-harvesting system

Quarry Mechanics
kestral

Adds quarry mechanics to stone nodes.

My Mason Hammer
Don

A hammer to make stairs, ladders and footholds

MTC Chisel
Can202

Add Chisel and new decorative blocks.

Watershed
paramat

A river / mountain range mapgen

Slats
v-rob

Adds decorative slats that have a lot of uses.

Loose Rocks
eduardomezencio

Adds loose rocks which generate randomly on the surface.

Chocolatestuff
lazerbeak12345

Adds edible chocolate tools and armor to Minetest.

Axis Tools
mt-mods

All the functionality of tinkers construct, but all in your inventory.

Ephesus
Horka

Added ancient architectural blocks from the Mediterranean

More Stones
Blocky Player

Provides a variety of educational and decorative minerals and rocks.

The Confluence
MisterE

A luamap example - a small (500x100x500) Island in the middle of the ocean with 4 rivers that run from the center to the sea.

Multitools
ChimneySwift

Adds a series of multi-purpose tools to Minetest

Craftable Lava
MikeRedwood

Enables the crafting of lava from baked stone

Multiplant
Firefall

Grow Multiplants and get a random seed or flower!

Cones: Traffic and Training Cones
ClassicAdam

Cones. Various use traffic cones and training cones. 3 sizes, 10 colors, 30 cones in total.

Fast Build Tool
playduin

Tool for fast box building

Infinite Chest
Dragonop

Adds a configurable chest that gives an infinite amount of something.

Dirtcraft
dayer4b

Adds automatic crafting recipes for making most kinds of dirt

Swamps
Hybrid Dog

Adds swamps

Morebricks
CalebJ

Adds an assortment of new bricks to build with.

CodeBlock
giga-turbo

Use lua code to build anything you want

vexcazer
AiTechEye

Ultimate build+mine & admin tool

Pixelart
Linuxdirk

Nodes for pixelart grouped in color palettes

Placeable Buckets for Catching Rainwater
Noodlemire

Allows empty buckets to be placed as nodes in order to collect rainwater.

Treasurer
Wuzzy

A framework to define and distribute random treasures into the world.