For mechanical design & drafting I've used CAD/Draw4 by TommySoftware for many years. I have now switched to TurboCAD. I bought version 8 after trying out the free learning edition (version 4). I found TurboCAD easier to use than CAD/Draw4 and it has all of the features that I use from CAD/Draw4. I haven't used version 8 for any real work yet because I've found v8 no easier to use and I haven't found any useful new features in v8. TurboCAD pulled the plug on the learning edition but thanks to FreeCAD.com the link above will still get it for you.
Last Updated 03/27/2011