Project Dogtag is an opensource version of Red Hat Certificate Server. It was released to public in late March, 2008, installs on Fedora8

From installation perspective a very straightforward install.

1. Installed Fedora8, default options
2. Followed instructions on http://pki.fedoraproject.org/wiki/PKI_Main_Page
3. I did not choose to compile, rather opted for compiled version
4. Installed the pre-requisites as the instructions on wiki said
5. Then proceeded with the instructions
6. Up and running in about 2 hours.

I would say try it out, and start using it.