You could try Co-Create Modeling Personal Edition. You can get it here: http://www.ptc.com/offers/tryout/pe2.htm[^] It's a shame you can't get Alibre up and running though. I have used Alibre Design in the past and it was very good especially for a freebie. I haven't done much at all with Co-Create because we use SolidWorks here so there's no real need. I didn't find it that intuitive though but maybe that's because I'm more used to the Alibre and SolidWorks way of doing things. I hope this helps in your quest for free CAD/CAM ;)