Unices that are distributed gratis include GNU/Linux, *BSD, Solaris/OpenSolaris, GNU/Hurd, and MINIX.
There are hundreds of GNU/Linux distros, about a dozen distros of *BSD, around three distros of OpenSolaris (including an official one), and one or two somewhat usable distros of GNU/Hurd. Solaris and MINIX have only one version.
There's quite a bit of choice available, though most people stick to GNU/Linux and *BSD.
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What are all the true real Unix GUI?
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Well, all Unix systems make use of the X window system for graphics. Now, the standard window manager for X is
twm. =P
Obviously, the dated twm is not the "real Unix GUI". Nothing really is, and I can say that without even knowing what you really mean by "GUI".