This really has nothing to do with Haiku, but I haven't seen such a useful website in a while... Basically, there's installed versions of open source CMS' on OSCMS that you can try before you buy... (ok, get for free)...

What an ingenious and useful website for website developers. One of my favourites, is OpenGoo... yes, a GoogleDocs like CMS. (login: admin password: demo123).