I suspect most people don't see much value in the SourceForge software. I mean, all of the important stuff is just stock open source software. The real value is that they host it and I don't have to set it up. If I really needed an in-house system, I would install CVS, create a mailing list on the company mail server, and install that Perl script for browsing CVS. Seems pretty straightforward to me, and doesn't require a new development project.