ColdScripts is a good site with links, summaries, and rating for a bunch of PHP applications and frameworks. It has a few discrepancies and outdated listings, like WACT and Ambivalence for MVC frameworks (but, hey I still use Ambivalence for klamathsystems.com.  That’s how I found it, after migrating Klamathsytems off of Westhost to share the same Linode as One Shore.)  The ratings looked fairly accurate and up to date however

Example categories include:

• frameworks
• blogs
• cms
• ecommerce
• forums
• galleries
• wikis

A surprising absense was Magento from CMS