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8. Ubuntu Unity
Some may be surprised to see Unity included here, but it deserves its place because it proves Canonical is still committed to pushing boundaries. I also include it because its rise has really taken the Linux desktop to a new level, making designers and developers realise that they can't sit back on their reputations. Now every desktop in the Linuxverse is enjoying new life and development. Even if you hate Ubuntu Unity, you must give it credit for rejuvenating the Linux desktop.