Waterfalls
Termos

Adds water erosion, so flowing water forms somewhat more realistic looking waterfalls.

Angled Stairs
TumeniNodes

Adds angled stairs to the Minetest Game.

Pillars
citorva

Add a lot of pillars for fun.

More Snow
Sokomine

snow and wool for stairs - nicer winter landscape and snow-covered roofs

My Default Lights
Don

Simple lights made from default material

My Flooring
Don

A basic set of flooring

My Stone Paths
Don

Stone paths

Node houses
MatyasP

Node houses is a mod by MatyasP that adds one-node block of houses, for crafting using items from mode default.

Plaster
Extex

Adds a variety of Plaster blocks for building.

My Slopes
Don

MySlopes

My Default Glass
Don

Glass made from many default items

Falls
Just_Visiting

A Particle-based Waterfalls/Lavafalls Mod

My Wood Slopes
Don

Make slopes with wood blocks.

My Press
Don

A press to flatten steel

Zughy32 colored blocks
MisterE

Plain colored blocks from the Zughy 32 palette.

My Paths
Don

Dirt paths.

My Siding
Don

Adds lines on one side of block to make it look like siding

Better Ice
TheFanne

Modifies ice so that it melts into water when broken, and will be melted by torches

Rainbow Source
Shara

Adds coloured water.

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.

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.

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

Mycorners
Don

Put decorative corners on blocks.

Stoneworks
TumeniNodes

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

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.