FreeCAD - An open-source parametric 3D modeler
Keyshot - KeyShot 3D rendering and animation software is the fastest, easiest way to create amazing, photographic visuals of your 3D models. Enter your search in the box aboveTryYour download of KeyShot is only moments away.
SketchUp - 3D for Everyone
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
PathEngine - PathEngine is a middleware toolkit for the implementation of intelligent agent movement, built around and implementation of points-of-visibility pathfinding on 3D ground surfaces.