While there are many open source repositories using CVS, SVN, and git, I'd like to know if there are any built atop Perforce, as I've been happily using that for CM at home for many years now.
Perforce provides a public depot, but the projects hosted there appear to be strongly Perforce-oriented. What I'm working on has nothing to do with Perforce, I just like their product. The company provides a free license for hosting an open source project, but I have no interest in maintaining my own server out on the web.