Joomla
This is a sh404SEF plugin for the Joomla component Phoca Download. The original code was written by Branislav Maksin. I've rewritten most of it to make it suit my needs better. Use at your own risk. The plugin will generate SEF's in the form menuitem/section/category/file. It's in use on the download area on this site, so have a look there if you want to see how the URL's look. There's no support for several languages or different settings, but the code is trivial and should be very easy to modify to your own needs.
Worth noting is that even though the Phoca Download administrative interface doesn't allow you to create nested categories, it's database does. This extension supports nested categories.
