Here are some toolkits / libraries / APIs I came across today that are worth a look. Please add to the list if you know of another. Some of these may be beyond the average web designer’s ability to utilize, but larger teams with dedicated developers will make good use of them.
“moo.fx is not a replacement for script.aculo.us or other effects libraries. It’s just a little alternative for people (like me) that do not need more than just simple, basic effects (and want to keep their filesize small).”
“WebWork is a Java web-application development framework. It is built specifically with developer productivity and codesimplicity in mind, providing robust support for building reusable UI templates, such as form controls, UI themes,internationalization, dynamic form parameter mapping to JavaBeans, robust client and server side validation, and muchmore.”
Just found Wikipedia’s entry for AJAX, which has a big list of libraries including some of the above but many more.