Blender looks great but is a bit oddball too (though less so now). I’d also nominate QGIS as a good open-source app (UI). Maybe not “art,” but I think it’s beco

Blender looks great but is a bit oddball too (though less so now). I’d also nominate QGIS as a good open-source app (UI). Maybe not “art,” but I think it’s become almost de facto for what a hobbyist will reach for first, and it’s generally quite user-friendly. But they are rare!