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.