I've previously used AutoCAD for frame design, making use of a copy on my work computer, and logging in via remote desktop etc. That was always a bit of a pain to do.
I contemplated buying my own copy, but balked at the price - for such a straightforward piece of software, they charge like wounded bulls.
Thankfully, now there's a free tol that's able to read AutoCAD .dwg files, and is driven almost exactly the same as my trusty old AutoCAD LT2000. It's called Draftsight, by Dassault systems (who also do Solidworks).
So I've started using that for my frame designs. It runs on windows, mac, and linux. I'll probably put my frame designs up in .dwg format, so you'll be able to view and edit them.