We've been evaluating CMS software and I'm amazed at the breadth of offerings, just in the free/PHP4/MySQL arena. I haven't been bowled over by any yet, but it's still early in the evaluation process. We've defined what we're looking for and now we are examining candidates. A tricky thing is to figure out how well each would handle a big demand, in the off chance our web site should become really popular. And it doesn't seem like switching your CMS (Content Management System) (or even a CMF - Framework) is something you could easily do. So we're trying to be very careful here.
We've come across a couple of sites with long lists of contenders. The first only considers free, PHP4, MySQL CMS packages, and even with that stringent requirement, there must be over 50 listed. There's even demo setups for each of them, which is really cool. Also neat are the user comments for each.
OpenSourceCMS
The other one doesn't even narrow it down that far, but it does let you compare a matrix of features, talk about each and rate them.
The CMS Matrix - The Content Management Comparison Tool
