What are some alternatives?
When comparing COSMOSWorks and SolidWorks, you can also consider the following products
COMSOL Multiphysics - COMSOL is the developer of COMSOL Multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems.
SketchUp - 3D for Everyone
FEATool Multiphysics - FEATool Multiphysics is a fully integrated Finite Element FEM CAE simulation toolbox for Matlab.
FreeCAD - An open-source parametric 3D modeler
elmer - Elmer is an open-source software package that solves partial differential equations. Combined with its ability to run various equations in parallel, it is an effective tool for running multiphysical simulations. Read more about elmer.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.