I have just spent about an hour at this site and if I spend a hour at a site you can bet that it caught my attention. There are many open source web building packages out there but sometimes it is a pain to set them up to just test them.
Well they have set up a huge number of open source web building packages and you can try them fully they have some of them set so you can see the administrator side of the packages giving you the insight to see if the package will do what you want it to do. [www.opensourcecms.com]