This package is excellent for those who want a functional 2D only Cad package.
http://www.3ds.com/products/draftsight/free-cad-software/ (http://www.3ds.com/products/draftsight/free-cad-software/)
It appears to a clone of AutoCad and the interface is command line based.
Don't think this is AutoCad 2013 because if you do you will be disappointed. I have access to the most items from the Autodesk suite through work, however I still think this package is excellent for its simplicity and functionality.
Thanks UIZ733.
Always nice to see a good freebie.