OS.js is an open-source desktop implementation for a fully-fledged window manager to your browser, Application APIs, GUI toolkits and filesystem abstraction. It works in any modern browser and is implemented on any platform using Node or PHP. OS.js is completely free and open-source which means that you are able to contribute to the development or make use of the code as you like.
Requirements: –
Demo: http://os.js.org/
Permit: License Free