For prc-tools, the best thing to do is go straight to the home page of the project on Sourceforge, here. You can get RPMs or, if you're adventurous, a set of patches to apply to gcc. Note that currently a lot of the sample code doesn't work too well with some of the more recent tools.
For pilrc, it's maintained here; click on the link in the lower left. Also check out the "patch-zone" link on the pilrc page.