Angled Walls
TumeniNodes

Angled & Sloped Walls, Angled Glass, & Angled Doors

Castle Shields
FaceDeer

Adds decorative wall shields

SuperQuest
Andrii

Allows to create quests with rewards which can be passed by triggering flags placed in different places

Magma Conduits
FaceDeer

Removes default mapgen lava and adds widely-spaced vertical lava "veins".

ArtDeco
TumeniNodes

This mod just adds some new building blocks to Minetest.

Christmas Tree
ExeterDad

Adds a decorated indoor Christmas tree with wrapped gifts.

pkarcs
TumeniNodes

Adds arched doors

Nssb
TenPlus1

BIOME integration for nssm, the not so simple buildings.

Portable Chests
Bob64

Portable chests you can pick up even when there are items inside.

NextGen Bedrock
StarNinjas

Adds an indestructible bedrock layer at the bottom of the world.

Boost Cart
Krock

This mod offers improved minecarts and a few more rail types.

Coloredwood
mt-mods

Colorize some wood!

Stripped Trees
1faco

Adds Stripped tree trunks.

Procedural Furniture
the_raven_262

Creates furniture collections

MOAR! ARMOUR!
Duvalon

Additional armours to build and wear

Simple Xray
MikeRedwood

Makes stone and desert stone see through, also works with nether mod

Scaffolding
Semmett9

Adds wooden and Iron scaffolding.

Darkage - the original plus improvements
addi

DarkAge adds several new nodes and crafts to create a pre industrial landscape.

In the Fog
Jo5629_

Herobrine has entered your world.

MobConf
zeuner

Place, remove and configure Mobs (for now: NPCs) using chatcommands

pilzmod
Phii

a spreading mushroom biome which you can spawn into the world, with its own monsters and a boss you need to slay to stop the biome's growth. Best played with bow & armor mod and after reading manual.

Craftable Lava
MikeRedwood

Enables the crafting of lava from baked stone

Zero-Effort Custom Minerals
Piezo_

A tool for registering entire materials, complete with ore generation, tool-sets and automatically generated sprites with almost no effort required

Mylandscaping
Nathan.S

Lets you put up decorative walls around your gardens, and make pretty hardscapes.

boomstick
fluxionary

a tool for testing the behavior of tnt

Minetest 2D
AiTechEye

Transforms the minetest world into 2d dimension

Geodes
AwesomeDragon97

Adds amethyst geodes and an API for making custom geodes.

XBlocks
GamingAssociation39

Additional blocks for decoration/building

Modern Ish
thomasthespacefox

A collection of modern-ish odds and ends.

MT Expansion
GamingAssociation39

An expansion for MTG

Cucina Vegana
Clyde

Adds plants and spices for a vegan kitchen

Ephesus
Horka

Add Decoratives blocks and columns of Ephesus

Upgrade Packs
Krock

Provides craftable packs to players to increase their health and breath

Coconut Trees
AwesomeDragon97

Adds coconut trees that appear on beaches

Sieves
AwesomeDragon97

Adds sieves that are used to separate (occasionally) valuable debris from sand.

More Stones
Blocky Player

Provides a variety of educational and decorative minerals and rocks.

Transporter
mt-mods

Adds a configurable technic-based transporter, with bookmarks and many options

3d ores!
Soundwavez

a slick new take on the default ores!

Hardcore Farming
Neuromancer

Makes farming a hardcore challenge by adding very hungry pests. Can you overcome them or will they defeat you?

Axis Tools
mt-mods

All the functionality of tinkers construct, but all in your inventory.