Salome Platform is a nice open source CAD tool (and much more) that can easily be installed on various nixes. In my work I am encouraged to use the Windows system. As a note to self, this is a small gist on how to install and run Salome Platform on Windows 10 (64 bit).
Head over to the Salome Platform website and locate the current download link for the Windows binary. Download the zip file and unzip it in a location sensible to you.