GNOMETM is a very mature and advanced desktop environment that is part of an entire stack of software. The GNOME 3 project was designed as a desktop environment based on simplicity that utilized modern UI to manage applications. The look and feel is very similar to the Mac OSX with the exception that GNOME is very highly customizable so you set up your computer like a Mac, or similar to the Mac interface but with customization only found in Linux.
Much of the customization comes from the Tweak Tool, but the shell is also very easy to expand using the shell extender plugin that is installed on FireFox out of the box. GNOME is not my first environment of choice for the novice user due to the limited out-of-the-box functionality, but for the comfortable computer user it is a powerful choice to for a modern computer running Linux.
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