There's loads of free CAD software here:
http://www.freebyte.com/cad/cad.htm#2D3DCADSystems

As for the CAM prgram, take a look at Delcam's ArtCAM program, Thier currently doing the express version for £99 online at the moment which is pretty amazing considering its a high quality piece of software from the world's leading CAM supplier!

http://www.artcamexpress.com/