Choose your version (previous ones on my web page if you really want them):
Both work fine on my 5500 with OZ3.3.6pre1, I assume this means it'll work on anything.
Note that I've not included any toolboxes (this is the next stage of my masterplan) so you probably can't do all that much with them, and you will get non-fatal errors at startup. If anyone is actually familiar with R (I'm not really) then I'd be glad to hear whether they are working as they should, etc.
You'll also need this lib: http://sgp.zaurii.net/binaries/libg2c_0.0.0_arm.ipk
some form of X11 to be able to produce plots.