Minium is a project mainly written in PHP, it's free.
A simple example on how to using Lithium as a microframework
It's for you all minimalist lover but want powerful tools. Lithium is an awesome and powerful framework. But sometimes you only need routing without all wacky wacky MVC. Minium is an example of how to do it.
Clone this repository and save it in your lithium folders so your folders now consist of
app, libraries, and minium. Change the contents of routes.php and filters.php to
your needs. Access it via http://your_domain/path/to/lithium/minium.