Sketch - Professional digital design for Mac.
MagicaVoxel - A free lightweight GPU-based voxel art editor and interactive path tracing renderer.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Goxel - Goxel is a simple, but powerful voxel graphic editor with 24-bit color support, unlimited scene...
Affinity Designer - Professional creative software, exclusively for Mac.
Cubik Studio - Model in a unique cubic style. Start modelization with boxes. Move, rotate and scale cuboids.