>Here is a proposal from November by someone who wanted to do a free
>reference implementation of the SCA (Software Communications
>Architecture) specification.
>I also am not sure to whom the proposal was submitted or what became
>of it.
CRC (Canadian Research Center - something like NSF) made this proposal to
the SDR Forum. As far as I know, it is not accepted yet, and they don't want
to release the code before it is accepted.
I am also implementing an SCA compliant SDR as my thesis and I am planning
to finish it by June.