Do open-source AJAX tools match the pros?

There are some decent open-source tools for coding enterprise applications using the asynchronous Java and XML method, but in general the tools aren't as good as commercial versions. Dojo is one of the best, along with Google Web Toolkit, Open Rico/Prototype, Yahoo AJAX Library, Zimbra's Kabuki AJAX Toolkit and even Microsoft Atlas (not open-source but you own its code.) For certain uses they match pro tools like Backbase, JackBe and Tibco's General Interface.

For more on AJAX:
- check out this InfoWorld article