My Ladders
Don

Adds different ladders to Luanti

Pillars
citorva

Add a lot of pillars for fun.

Columnia
mt-mods

Adds simple pillars and columns

My Default Glass
Don

Glass made from many default items

Tables
AwesomeDragon97

A simple mod that adds decorative wooden tables.

Useful Contraptions
theFox

Some useful contraptions / machines.

Abritorch
mt-mods

multicolored torches

Prefab Redo
cheapie

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

Embedded Lights
scr267

Decorative block embedded LED or Potlights

My Wood Slopes
Don

Make slopes with wood blocks.

My Cobble
Don

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

Gates (wider)
Sokomine

Wide gates for easy walking through and keeping cattle inside

My Default Fences
Don

Adds more default fences

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

More Ladders
SkyBuilder1717

Adds more ladders and sticks!!!

My Default Lights
Don

Simple lights made from default material

X Clay
SaKeL

Adds hardened clay.

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

More Mese Post Lights!
1F616EMO

Add more mese post light

Rainbow Source
Shara

Adds coloured water.

My Mulch
Don

Turns leaves and other items to mulch blocks

Blox
mt-mods

Adds lots of differently colored and textured blocks to Minetest.

Saphire
Ryft77

Adds saphire stuff

ColoredCement
Truemmerer

Add Cement Blocks with unifieddyes support

New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Bunker Block
Spooks

Add blast proof concrete and its craft items.

Ethereal: All-faces tree blocks
1F616EMO

All-faces tree block for Ethereal trees

Pink Lava
TenPlus1

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

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

Tile Floors
ClassicAdam

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

Weedstone Random Mod Thing
chaosomnium

Originally meant to be a simple electronics type mod inspired by redstones, I messed around with the code after getting bored and got this weird mod, and now it's this thing. Enjoy I guess?

Alien Tools
chaosomnium

Alien Tools Mod for Minetest - adds Alien Tool, Shield, biome, etc

Better Ice
TheFanne

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

Stack Slabs
TumeniNodes

stackable slabs for Minetest

Protector Redux
sorcerykid

An efficient and flexible node-based protection scheme for multiplayer worlds

WorldEdit Wall Block
SkyBuilder1717

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

Maple tree
Duvalon

Adds a maple tree placed during world generation.

Explosion proof obsidian
Miner34

Adds an explosion proof obsidian.

Tac Nayn
GreenXenith

Adds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).

Floating Anchor
Starbeamrainbowlabs

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