Frame builders: Anyone have tubemiter.exe application?

The app isn't going to mitre the tubes for you.
A, fairly, basic drawing will tell you where to cut.
Or you could use Autocad, if you want.
Or you could write the "tiny" app for yourself

Yeh but it will, however, make the entire operation a lot more precision and quick.

I'm not a developer, unfortunately. Need to get on that...