asset store has few, https://www.assetstore.unity3d.com/en/#!/search/page=1/sortby=relevance/query=voxel&terrain i have big list of voxel engines/sources (see comments for more links) https://unitycoder.com/blog/2012/10/18/voxel-resources-engines-for-unity/ and for inspiration check the original thread, https://forum.unity.com/threads/after-playing-minecraft.63149/