Avoyd is a voxel editor. You can use it to create and convert voxel assets to mesh so you can use them in Godot. If you go to the avoyd website you’ll find documentation on how to export a voxel model to mesh and how to import it into Godot. (Note if you use the free demo, you can use export to .obj instead.)
If you want to create voxel assets, check out our introductory tutorial. Avoyd can do a lot more, see the list of features and feel free to try out the free demo!

Greenfield city Minecraft map with fog rendered in Avoyd