Make a version that works on Mac OS X.
StruCalc is currently working on the development of an online web application to supplement the desktop version. This new version would be able to be used on any platform. I can't give you a delivery date on this. As far as an actual Mac only version, that won't be developed.
Would definitely support the Mac version
a Mac OSX version but be fantastic! until then I'll continue to use Parallels so I can have my Strucalc