Comboblock
sirrobzeroone

Allows the stacking of slabs vertically and horizontally

Geodes
AwesomeDragon97

Adds amethyst geodes and an API for making custom geodes.

Filled Bottles
EmptyStar

Filled bottles for Minetest Game

House Windows
DiamondPlane

Adds windows for your house

Template to Easily Make Fancy Voxelized Models
Noodlemire

Provides voxelmodel.obj, a model designed to be shaped by changing its texture, in order to easily create fancy voxelized models.

Definition Ripper
Warr1024

Generate inert facades from node/item definitions for use in other games