eyeOS is a completely free (Open Source) desktop system running from your browser, where anybody can collaborate and expand it.  Like desktop.com —eyeOS provides access to variety if applications, like WordPrecessor, Chat, Calendar etc. To use eyeOs, it requires download and installation.

If you want to see how is eyeOS, you can visit the screenshots section, or if you prefer it, watch the video from this page.
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eyeOS

eyeOS, Free Open Source Desktop