On looking into the matter, it seems Racket is available on Windows and OS X, so that's basically taken care of. Hopefully its source compiles on non-x86{,_64} platforms as well, but I don't really develop for those.
I'd suggest just trying to compile it on whatever machine you might have in mind.
git clone http://git.racket-lang.org/plt.git
cd plt/src
./configure
make
make install # this builds executables and docs in place; takes a longish while
