Sketch - Professional digital design for Mac.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Sculptris - Sculptris: Enter a world of digital art without barriers.
Affinity Designer - Professional creative software, exclusively for Mac.
ShapeShop - ShapeShop is an advanced and professional 3D design and modeling application that comes with an easy-to-use and user-friendly interface.
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.