Unity was created by Canonical in 2010 for Ubuntu. The idea was for it to be used in other Linux Distros, however it never really happened, although recently it did finally get ported to Arch.
The desktop version of Unity 7 has been around for a couple of years now and seen very little advancement. Unity 8 is available for Mobiles, Tablets, and Desktop. However the desktop version of Unity 8 doesn’t work with proprietary graphics drivers.

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