3D & CAD, for free
4 paid apps with a free way out.
AutoCAD, free options: Parametric 3D modeling and 2D drafting for mechanical and architectural work.Autodesk Maya, free options: Modeling, sculpting, rigging, animation and rendering in one open source app.Cinema 4D, free options: Modeling, animation, simulation and Cycles rendering in one free open source app.SketchUp Pro, free options: Browser-based 3D modeling with access to the 3D Warehouse model library.