Unless I am misinterpreting what you are saying, Red Hat has indeed released some source code for the Red Hat Network. Project Spacewalk (http://www.redhat.com/spacewalk/) is Red Hat Satellite but with support for CentOS and Fedora. AFAIK Satellite is much the same thing as Red Hat Network proper, just local.

PostgreSQL is also shipped by Sun with Solaris and is also supported by Sun... interesting to see what will happen if the Oracle purchase of Sun goes through...

http://www.sun.com/software/products/postgresql/

If the Oracle purchase of Sun does not go through, it seems Sun will still have some options to give Oracle user community some options to reducing licensing costs on the UltraSPARC platforms for custom built applications.