Somehow I only just learned of Vengi Voxel Editor, which while still pretty new is also fairly comparable to MagicaVoxel, and with the bonus of being open source.
https://github.com/vengi-voxel/vengi?tab=readme-ov-file#readmeHowever, I must also mention that Goxel has been around much longer, and while less robust, that's to its benefit in that it's easier to pick up.
https://github.com/guillaumechereau/goxel?tab=readme-ov-file#readmeIf you want to simply dive into voxel art, I'd say Goxel. If you want more, then open Vengi Voxel Editor.
#FOSS #Voxel #FreeSoftware