SolidWorks Composer - Easily repurpose existing 3D models to rapidly create and update high-quality graphical assets that are fully associated with your 3D design.
FreeCAD - An open-source parametric 3D modeler
Cadasio - Add a new dimension to your technical communications. Product documentation brought into the next dimension with Cadasio. Ideal for assembly instructions, service procedures, marketing assets and more!
SketchUp - 3D for Everyone
JigSpace - JigSpace is the easiest way to visualize your ideas, products, or instructions in 3D and augmented reality.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.