floret
floret is a very simplistic, static content management system that I have written in Perl. It was born out of my frustration with much heavier and more complex content management systems that I have dealt with in the past. Its concept and select few bits of its code are based on the excellent blosxom blog engine.
floret's database is the filesystem. It is driven based on folders and text files in a directory that you create and define on your web server. Each section of your site is a folder, and each page a simple text file. floret automatically styles your pages based on a template that you can easily define. It also automatically generates your navigation based on the folder structure that you have defined.
This website is a working example of floret in action. You can see the underlying file and folder structure that composes this site here.