http://www.cadsofttools.com/en/produ...ad_viewer.html
This is what I found. I have never used it although it sounds credible. It is free but that doesn't mean that it is crap. It is also from a complany that I have at least heard of before. This is just a viewer as for making parts I don't think any Palm/Pocket PC has enough processing power to do that therefore I do not think there is any software. Although I could be wrong.