I think its very unlikely that the researchers would be able to support another operating system. At GPUGrid the work changes quite regularly (lots of development and testing) and its difficult enough to make apps/tasks work on Linux and Windows for so many GPU types (GeForce 200 through to Keplers).
Even if the researchers had the resources and expertise it would be hard to justify, for what is likely to be a very small number users, as it would prevent other work.
There is only so much a small team can do and if they try to do too much they will get nothing done.
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Nowdays there's a non-negligible number of Macs around. However, most of them are laptops, so by definition not very interesting for GPU-Grid. And while it's based on Unix, development has driven Mac OS and Linux so far apart that they require separate drivers. As far as I remember there's never been driver interchangability between them.

Since Mac OS supports CUDA the initial port should ideally be straight forward, although reality might have something to say about this as well. I suspect the real problem here would be drivers. Just look at the current problems GPU-Grid faces.. it should work on Win and Linux, with any half-recent driver and on any half-modern GPU. Yet what we're seeing is.. something absolutely different. So before talking about yet another platform let's concentrate on fixing the current one first.

MrS
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Scanning for our furry friends since Jan 2002