Lucid Desktop is an open-source, web-based desktop.

Bundled with many applications, Lucid lets you browse photos, listen to music, edit documents, and much more, all within a single web application.

Lucid offers a variety of desktop applications (e.g. RSS reader, games, calculator, terminal application), third-party applications and add-ons, customization with themes and layouts, internationalization and Localization, file and user management, and easy to create applications, including a built-in IDE.