Tim Dardis originally designed LifeSaver on the Mac, but realized that his market was too small compared to other PC/Windows users. I spoke to him years ago when he was still designing for the Mac.
I believe that rather than having to worry about designing software for both platforms, he concentrated on Windoze and abandoned the Mac altogether.
… at least, I think so.
With the new Intel based Macs, just about any Windows software can run on them I believe. But, if you have any software that needs to run on OS 9, you're outa luck with the Intel Macs.