FreeCAD is a CAD freeware that has advanced motion simulation capabilities. This freeware is ideal for teachers, students, and other engineers, for their designing and learning dynamics, geometry, and vibrations, among others. FreeCAD also enables the users to manipulate parts assemblies in 3D. What is good about this Linux CAD freeware is that it has full Multibody Dynamics analysis that helps predict any motion in accordance with the Laws of Newton. This capability makes the behavior of the system more realistic. In addition to Linux, FreeCAD also runs in Windows, Mac, and other Unix system.