Underground Survival Lighting
Arkatron

If you like underground light in survival, use this mod, it can help that.

Technic Recycle
DumbDave961

Recycling recipes for Technic items.

Tinted Glass
1F616EMO

Colored glass

Prefab Redo
cheapie

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

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

Useful Contraptions
theFox

Some useful contraptions / machines.

sfinv++
swagtoy

Improves the inventory, and fixes some formspecs throughout some mods.

Quartz Geodes
AwesomeDragon97

Extends the Geodes mod with quartz geodes.

Mesecon Register Circuits
marek

Adds Latch and Flipflop circuits.

Lighting Rocket
lag01

For temporary lighting large areas

Castle Storage
FaceDeer

Contains storage containers one might find contained in a castle.

Blox
mt-mods

Adds lots of differently colored and textured blocks to Minetest.

doorbell
Miniontoby

A doorbell mod with sound

Lava + Water > Stone
1F616EMO

Cool Lava into technically special stones for easier cleanup

X Clay
SaKeL

Adds hardened clay.

World Borders
argyle

Add impenetrable barriers to the sides and bottom of the world.

Hard Trees
octacian

Require tools to break trees and introduce beginner-tier rock tools.

Medieval (Fork)
DragonWrangler

an addon to darkage

Startest
Robot10&Scheletor

This mod adds several space stuff to the game.

Ethereal Mosses
1F616EMO

More mosses for dirt types in Ethereal NG

Alien Tools
chaosomnium

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

Ice Machine
cheapie

A machine that makes ice cubes.

Candy
Kostivar

Adds candy which you can make from candy ores.

Technic use Battery
1F616EMO

Use energy from RE batteries in the inventory

Rotting Wood
Polynium

Causes wood to slowly rot while exposed to water

Cube Mobs
Xanthus

Adds various cube mobs with different abilities using mobkit.

Waste
Jolesh

Adds Waste and ways to recycle it into useful resources

Slot Machine Mini-games
mt-mods

Provides an "engine" to drive simple slot machines (includes two). Spins reels, takes in/pays out in Minegeld (Dan's currency mod), etc.

Wildflower Fields
mzs.112000

Adds a wildflower field biome to Minetest Game.

More Coral
Nathan.S

Adds coral in more colors.

Uncrafter
JoeEnderman

Adds an uncrafting table

Throwable Snowball
ComputeGraphics

Adds a throwable Snowball

Beautiful Boulders
regulus

Procedurally Generated Rocks with (pretty) Accurate Collision Boxes

moneybag
GigaByte

add money bag

Rainbow Source
Shara

Adds coloured water.

Color Blocks
mt-mods

Contains colored building blocks.

obsidian
GigaByte

more uses for obsidian

Pink Lava
TenPlus1

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

Mesecons Microphone
Maverick2797

Chat-toggleable mesecons node.

Coins
Clyde

Adds 3 kind of Coins to your game