New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Stoneworks
TumeniNodes

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

My Paint Extras
Don

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

Kotatsu Tables
Piezo_

Adds a new piece of furniture based on Japanese kotatsu tables

Pillars
citorva

Add a lot of pillars for fun.

Plasterwork
Sokomine

Add colored plaster coats to nodes

My Default Fences
Don

Adds more default fences

Steel bar blocks
sotha1

adds blocks made of steel bars (xpanes)

My Default Glass
Don

Glass made from many default items

Tables
AwesomeDragon97

A simple mod that adds decorative wooden tables.

Lapis Lazuli
LNJ

Adds lapis lazuli ore, items and blocks.

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

Stained Glass
andersje

Adds various stained glass blocks, originally by doyousketch2

Columnia
mt-mods

Adds simple pillars and columns

Mycorners
Don

Put decorative corners on blocks.

Ethereal: All-faces tree blocks
1F616EMO

All-faces tree block for Ethereal trees

ColoredCement
Truemmerer

Add Cement Blocks with unifieddyes support

Better Ice
TheFanne

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

Abritorch
mt-mods

multicolored torches

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

Brick Walls
philipmi

Adds brick walls from different types of bricks.

Colored Sand
LoneSurvivr

Adds dyed variants for the default sand.

Pink Lava
TenPlus1

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

My Mulch
Don

Turns leaves and other items to mulch blocks

Useful Contraptions
theFox

Some useful contraptions / machines.

My White Block
Don

a white block

WorldEdit Wall Block
SkyBuilder1717

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

Blox
mt-mods

Adds lots of differently colored and textured blocks to Minetest.

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

My Cobble
Don

This is a simple mod that lets you turn cobble into gravel and gravel into sand

Parcdeco
Floatland

adds grass-like nodes that have flowers

Tinted Glass
1F616EMO

Colored glass

Dyeable Steel Blocks
nemokitty9

Allows Players to dye Steel for decorative blocks.

Secret
artur99

Adds hidden and secret nodes.

Prefab Redo
cheapie

Cheapie's version of Dan's old prefab mod, which adds pre-fabricated concrete elements: catwalks, benches, ladders, railings...

Better Roads
DragonWrangler

allows players to make roads with less jagged edges

Saphire
Ryft77

Adds saphire stuff

Floating Anchor
Starbeamrainbowlabs

ExtraUtilities' Angel Block for Minecraft in Minetest! Place structures in mid-air with ease.

Color Blocks
mt-mods

Contains colored building blocks.

Rainbow Source
Shara

Adds coloured water.