Voxeliq Engine is now open source!

voxeliq is an open source block-based game engine implementation developed with C#. It uses XNA or the Monogame as the basis. It can be compiled with Microsoft .NET or Mono, which means you can run it on Windows, MacOS, and Linux. Please see the file LICENSE[1] for license details.

Source:

http://www.moddb.com/news/voxeliq-engine-is-now-open-source