A useful resource to compare Java web frameworks (Spring, Tapestry, Struts, OpenLaszlo,...) and also PHP, Python, Ruby web frameworks:
If you go to the site, you'll see they have a hierarchical list of web application frameworks based on real-word popularity. First of all, I'm unsure of what "real-word" popularity is.
Let's assume this is a typo and it should be "real-world" popularity. Where is the credible source for this data? Where is the link to this credible source? I like the list, its sortability and filterability, but there's no evidence that it's true. Care to elaborate on your sources firstname.lastname@example.org?