XtreemTest is a modern voxel game engine and a fork of another voxel game engine called Minetest; Minetest suffers from many severe issues such as censorship, tyranny, or bad content managment.
That is why I decided to create XtreemTest, a freedom-friendly fork of Minetest and ContentDB replacement (XtreemFreedomDB), it's like the 8chan of Minetest, we accept all content as long as it works and doesn't violate Natural Law.