Voxeliq is a block engine crafted with C# that can be used to develop block based worlds with any type of gameplay you can imagine. Sandbox games, RPG's or even RTS games within a blocky world! Engine is still being developed & optimized for production though we already started kicking in our first games with it.
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 for license details.
Source available over: Github.com