Painted 3D Armor
Beerholder

Adds banners to your armor, either painted using the painting mod or created using the banners mod

ColourJump
MrFreeman

A simple minigame where the players need to jump on the correct platform to avoid to fall down

Colored Sand
LoneSurvivr

Adds dyed variants for the default sand.

Ham Radio
techniX

Radio transmitters, beacons, and receivers

House Windows
DiamondPlane

Adds windows for your house

Colored Leaves
Otto

Adds several colors of leaves

More Crafting Recipes
RasPiManiac

Adds more default crafting recipes

Mypaint
Don

Provides paint brushes and buckets for other mods to use to paint their items.

Castle Farming
FaceDeer

Contains farming products useful for decorating a castle

Technic Diamonds
mt-mods

Use technic to grind and compress diamonds.

Better Locks
SkyBuilder1717

Adds locks and locked doors

Tinted Glass
1F616EMO

Colored glass

Art Paintings in Frames (high res, 512px)
ClassicAdam

Various paintings in frames for hanging on walls. High res at 512px.

Generic moon of Saturn
Red_King_Cyclops

Replaces the default earthlike setting with a generic moon of Saturn.

BingFeng Maidroid
XYChen

An improved version of Maidroid, providing maid robots.

Cassettes
X-DE

A mod that adds cassettes and a cassette player.

Valleys Mapgen
Gaël de Sailly

A map generator with valleys, rivers, mountains and many plants.

French Toast!
RasPiManiac

Adds French Toast. That's it.

Climbing Pick
lag01

Tool to climb, double jump, and do good damage to mobs.

My Sponge
Don

A sponge that soaks up water

3D Armor Gloves Armor Expanded
BryanGruik15

Adds gloves/gauntlets with the materials of Armor Expanded with 3D Armor Gloves Redo and 3D Armor.

player animation in water
GigaByte

adds an animation when swimming

My Fences
Don

Adds nice looking fences.

Hazmat Suit
1F616EMO

Protect wearer from fire and radiation

Time Travel
Red_King_Cyclops

Adds in a craftable time machine that can be used to time travel to different time periods of Earth's history.

My Press
Don

A press to flatten steel

Columnia
mt-mods

Adds simple pillars and columns

Embedded Lights
scr267

Decorative block embedded LED or Potlights

More Snow
Sokomine

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

Quartz Geodes
AwesomeDragon97

Extends the Geodes mod with quartz geodes.

Pink Lava
TenPlus1

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

Ufos
mt-mods

adds a ufo for flying around in

My Slopes
Don

MySlopes

Dyed Water
erov

Dyed water for mtg

My Chisel
Don

A chisel that allows you to shape blocks.

Blox
mt-mods

Adds lots of differently colored and textured blocks to Minetest.

Abritorch
mt-mods

multicolored torches

The Nether Reactor
Darth

The Nether Reactor from MCPE, added to Luanti!

Ancient Ice Stuff
Robot10&Scheletor

Adds a new powerful ore to the game

Useful Contraptions
theFox

Some useful contraptions / machines.