Try Before You Download

opensourceCMS.com has done technically minded webloggers a favor. The site lets you use open-source content management systems (some people use these for weblogs) before downloading them and installing them on your server.

From opensourceCMS's front page:

This site was created with one goal in mind. To give you the opportunity to "try out" some of the best php/mysql based free and open source software systems in the world. You are welcome to be the administrator of any site here, allowing you to decide which system best suits your needs. The administrator username and password is given for every system here and each system is refreshed on the hour, every hour. This allows you to to add and delete content, change the way things look, basically be the admin of any software system here with no fear of messing anything up.