When comparing Sproxel vs Goxel, the Slant community recommends Goxel for most people. In the question“What are the best voxel editors?” Goxel is ranked 4th while Sproxel is ranked 14th.
Ranked in these QuestionsQuestion Ranking
Pro Multiple export options
Exports to OBJ, MTL and 3MP.
Pro Free, open source and cross-platform
Sproxel is a free voxel editor that's available for Window and OSX. It's licensed under the New BSD License with source code available here.
Pro Intuitive UI
Pro Open source
At least somewhat available for GNU/Linux.
Pro Supports procedural rendering
You can script a build for it to render.
Pro Supports .obj
Pro Available on Android
Pro Exports to PLY format
Pro Available in Debian/Ubuntu repository
If you don't have it installed yet, just enter "sudo apt install goxel && goxel" on the terminal, and you will be running it in a few seconds.
Pro Simple Interface
Pro Available on iOS
Works nicely with Apple Pencil.
Hasn't been updated since 2012.