eyeOS is an Open Source Web Desktop Environment, commonly known as Web Operating System or Web Office.Here is the official word:
Imagine
being able to sit down at any ordinary computer in an Internet cafe or
public library, start up the resident web browser and access your
personal desktop – along with your applications, messages, and
information – with a click of your mouse button. Then, when you’re
done, you simply close the web browser to have all of the documents
you’ve just worked on safely stored on your remote server, leaving
nothing on the computer you’ve just been working on. This is the goal
of the mobile desktop and operating system called eyeOS.
I find it very useful and this is how my web desktop looks like
Maverick 