XWT - XML Windowing Toolkit

You don't "install" web pages; you simply visit them. Why should applications be any different? ... Existing HTML/JavaScript developers can be productive immediately developing XWT user interfaces. This is because XWT visual layout is specified using a dialect of XML which is extremely similar to HTML tables, and because interactivity is scripted in industry-standard ECMAscript (JavaScript). No special tools are required -- just a simple text editor and a zip archiver.

The XWT Engine is packaged as both an ActiveX control and a Java applet, so you can access XWT applications from all major platforms (Win95/98/ME/NT/2k/XP, Linux, Solaris, MacOS X) without installing any additional software.

I just noticed this link in a Slashdot comment. A cursory over-view of the reference manual shows many good ideas for a small-scale, RAD app builder. Haven't played with it at all, so I don't know how good it is in practice.

Oddly, considering the subject matter, the site does not seem to have a "Click Here to Try It Out!" sample.