autc04 said:

And as far as resources are concerned, I had a little free time a few months ago that I used for reimplementing (parts of) the Rez compiler. It's buggy, has various missing features and it prefers crashing over reporting an error if it's given incorrect input, but it can compile .r files.

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Are you aware of the fact that the ancient SUMACC cross-compiler tools from Stanford include a resource compiler called "rmaker"? The SUMACC code can be found in the 4.3BSD "new.tar.gz" fileset at http://www.tuhs.org/Archive/4BSD/Distributions/4.3BSD/

Building the cross-compiler itself on OS X fails due to ancient K&R C code, after fixing the compiler errors, the compiler continues to crash. It works fine when compiling on 4.3BSD in the simh VAX emulator. However, rmaker seems to work fine on OS X - but I don't know how useful it is, considering it was last updated in 1984.