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I haven't installed it yet but I believe that it's more than just a reskin.

There's a custom set of desktop apps built using a their own language, Vala.

They also have a pay what you want app store to support and all apps there are FOSS.

They didn't create Vala, rather they adopted it because it's modern syntax makes it easier to write gtk+ based applications than doing it in C.

Aha thanks, that's interesting. I guess that leaves their tuning and custom apps in there then.