In the BBC FAq, Section 2, 2nd line:
Can I use Linux or a Mac.

quote
Unfortunately the Apple Mac is not yet supported for the BBC Climate Change Experiment. You can though install OS X compatible climate experiments from climateprediction.net.

BOINC supports a lot of platforms, even though few of the project users are running them.
For instance, if you look at BOINCstats, you can see that Mac users are about 2-3% in any of the projects, including SETI, the one with the largest user base.

On the BOINC web site, if you select the download page, and look at \"version details\" for the Mac standard gui, it says that \"BOINC now works with OS 10.3.0 or higher.\"
here

There are also other choices on the BOINC site for running a Mac.

As for the science applications, this depends on the resources available to each project.

There are only 2 programmers at Oxford University working for the \"Atmospheric, Oceanic & Planetary Physics\" department. This is the section working on the Climate prediction project, of which the BBC project is a temporary offshoot. (About 8 months I think.)
The time given to them by the BBC, to produce applications that were very reliable, with an interface that was simple enough for any memnber of the public to use, was too short to include one for the Mac, which is also not a computer of choice for many people. Including the alpha / beta testers.
As it was, some of the publicity given by the BBC about how simple and easy it was to use, was a bit optimistic, so a lot of people are having problems, even with windows.

To make matters worse for Mac users, I\'ve heard that future developement of Mac versions will be for the new Intel Macs. This will let the programmers use their existing Linux compiler.

In the early days of cpdn, the Mac platform was supported, and functioned well, but the research has moved on to a more advanced phase, which requires more modern computers and OS versions.

Perhaps one of the many other DC (Distributed Computing), projects would be more suitable for you. E.G. Einstein, or LHC should produce usefull work.