1. Lucid Desktop
Lucid is a free, open source web desktop, or webOS that lets you to access your media, office documents, and other files anywhere , stay up to date with Twitter, RSS feeds, and what’s happening on the web and Create great web applications in ridiculously short amounts of time.
2. Comet Desktop
The backend is written in Perl and Mysql. The front end consists of a heavily modified qWikiOffice, ExtJS, and various libraries and widgets created by programmer.
3. Sencha Desktop
Demonstrates how one could build a desktop in the browser using Ext components including a module plugin system.
4. Jquery Desktop
Desktop powered by Jquery.
This is a ‘Web 2.0′ Ajax PHP/MySQL desktop website that uses the extjs code library.