Download CadStandardLite for free at
http://www.apperson.org/cadstd/lite.php
Download Ally Cad v3.4 for free at
http://www.allycad.com/
FreeCad has a motion capability Download at
http://www.askoh.com/freecad/index.html
The standard for many is Turbo CAD Here is Learning Edition 2D Free at
http://www.al-ki.com/tcad/download.php#TurboCADLE
The price is right so check them out to see which one is right for you!
Happy drawing!
DEE