Rainbow Source
Shara

Adds coloured water.

Quartz New
alerikaisattera

Quartz and quartz glass building blocks

Embedded Lights
scr267

Decorative block embedded LED or Potlights

X Clay
SaKeL

Adds hardened clay.

New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Lapis Lazuli
LNJ

Adds lapis lazuli ore, items and blocks.

Blox
mt-mods

Adds lots of differently colored and textured blocks to Minetest.

Digilines Lightstone
1F616EMO

Digiline-controlled light-emitting colour blocks

Useful Contraptions
theFox

Some useful contraptions / machines.

Ethereal: All-faces tree blocks
1F616EMO

All-faces tree block for Ethereal trees

My Default Fences
Don

Adds more default fences

Legendary Ore
DynamaxPikachu

Adds legendary ore and blocks

Colored Blocks
sermow

Different colors of: stone, stone bricks, wood obsidian, and glass

Tables
AwesomeDragon97

A simple mod that adds decorative wooden tables.

Roadway
X17

Adds simple roads in 4 sizes.

My Bricks
Don

Machine to make bricks out of common material

Color Blocks
mt-mods

Contains colored building blocks.

WorldEdit Wall Block
SkyBuilder1717

Adds block and item for making big structures easily as possible.

Parcdeco
Floatland

adds grass-like nodes that have flowers

Cube Nodes
Andrey01

Adds colorful blocks with various symbols as letters, digits, punctuation, emoji and special signs.

Safe Chest
Atlante

Add a safe chest with secret password

Node roads
MatyasP

Add much of one-node roads and crossroads, road bridges and slopes

Better Roads
DragonWrangler

allows players to make roads with less jagged edges

K Color Blocks
ketwaroo

Adds specific stainable blocks for building stuff in creative mode. Comes with a rainbow wand for applying the tints.

Mycorners
Don

Put decorative corners on blocks.

Stoneworks
TumeniNodes

Stoneworks simply adds some fun, and cool building options to Minetest.

Tinted Glass
1F616EMO

Colored glass

Better Fences (1F616EMO Redo)
1F616EMO

Allow fences to connect to all nodes

More Curves
Just_Visiting

Adds 10 new curve shapes to game.

ColoredCement
Truemmerer

Add Cement Blocks with unifieddyes support

TP Gate
AiTechEye

Teleport through the gate

Kotatsu Tables
Piezo_

Adds a new piece of furniture based on Japanese kotatsu tables

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

My Paint Extras
Don

Allows you to paint dirt, gravel, wood, trees and more.

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

Saphire
Ryft77

Adds saphire stuff

My Ladders
Don

Adds different ladders to Luanti

Tile Floors
ClassicAdam

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

Pink Lava
TenPlus1

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

Steel bar blocks
sotha1

adds blocks made of steel bars (xpanes)