I'm currently looking at mod_realdoc from Rasmus Lerdorf / etsy, to find out if it can scratch one of my itches at work. Since the packaging in the etsy github repository is slightly incomplete, and there are no real tarball releases I've rolled one on my own. For Debian/jessie I've dumped a test build here and for Ubuntu 14.04 I've wrestled with launchpad.net and created a ppa.