CloudOS by Anamo.eu
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Anamo.eu CloudOS is a free-from-hardware graphic interface between a user and his applications. It uses the web browser as a host, and replicates the desktop environment of an operating system. This allows users to save the current desktop state to return to later, much like the hibernation feature in many client operating systems, and for multiple users to collaborate using a single environment. This web service is based uppon Silverlight, a Rich-Internet-Applications, cross-platform plug-in for web browsers.