Free/cheap terrain voxel plugins.

I’m currently using Voxel Plugin but found out that you cant flatten land/return the voxels to an original location. So now I need a new one. I would prefer it to use UE4’s terrain object, but It doesn’t matter that much. The only thing I need is material painting, adding terrain, removing, and setting the “height” of the voxel. Anything would help, thanks!