Brian Hutchings,
I use Design Cad having migrated to it from Draft Choice for Windows. Initially, I used v2000 (DC2K), and ok, it's an old version but it did all that I want in 2D. It does have 3D capabilities which I'm currently trying to get to grips with.
Some years ago, I upgraded to v 17.2 (DC17). For me, iIt did not offer anything much over DC2K, but nevertheless, I still used it. DC17 is also 3D.
DC2K cost me £13.00. DC17 cost maybe £25 purely because it was already an old system when I bought it. I believe the current version is v.24.
Two years ago, I moved over to Linux Mint v.13 with the Mate GUI. I then discovered that using Wine v.1.4, DC17 would not run, but DC2K did albeit with a couple of minor niggles. Using Wine v.1.6, and DC17 worked better, but not perfectly whilst DC2K was more or less perfect. Using Mint v. 17, Wine 1.6, and DC17 became very much more usable apart from one niggle which was easily surmounted. Unfortunately, I do have a problem with another program which means that I have to continue using Mint 13, hence am stuck with DC2K. Having said that, DC2K does have the better help system.
I apologise to non Linux users for the jargon used above. Linux users will immediately know what I'm talking about.
The bottom line is that if you can pick up an old version of Design Cad, it will be quite cheap, it will run quite well under Windows, and certainly DC17 and earlier can, if necessary, be made to run under Linux.
For what it's worth, I tried to use TurboCad, and had so much trouble that would actually dissuade anyone else from trying it. I found DesignCad much easier to use and understand.
Regards,
Peter G. Shaw