Hi,
You can get this library here: GitHub - francois5/voxelengine: A voxel engine library developed for jMonkeyEngine
The code is not well documented yet but I think it’s pretty easy to use and there is an example in the test package. The engine has 3 very simple interfaces that let you define your voxel types and the world generation procedure (the world is generated on the fly).
This is my first 3D project and this library is not very good for graphical stuff right now but I will work on that soon.