Artboard Studio - Online graphic design app mainly focused on product mockups.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Vectr - Free vector graphics editor. A simple yet powerful web and desktop cross-platform tool for everyone.
FreeCAD - An open-source parametric 3D modeler
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming