Sun and corporate open source

You can add the distributed file system Lustre to the list of sun-sponsored
source-available projects.  

In addition to issues of control, it's a tough balance to strike when your
revenue model is to give away the software and sell support. A lot of
responses on the lustre mailing list are along the lines of "we'd be happy to
fix that. Please contact us about a support contract".

You can give away source code (and Lustre is under the GPL), but open
development is an important component of successful open source projects.