I just published a beta release of my SDL version of the Fitzquake engine. The main goal of this version is to allow Fitzquake to run on all major platforms. I provide builds for Windows, Mac OS X and Linux.
Windows and Linux users take note that you have to install SDL 1.2.10 or better.
Windows users please also be aware that this port does not do anything better on Windows than metlslimes original version. Actually, it does less, but I would still like to get your feedback because there's a chance that the official version will be switched to SDL eventually. That would go a lot smoother if we ironed out the bugs on all platforms first.
Have fun and don't forget to send in your feedback and bug reports.