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I've spent two minutes look at this website and I still have no idea what this project is.

https://docs.openindiana.org/misc/openindiana/ looks like what you wanted, was not straightforward to get there from the homepage.

It's a distro of OpenSolaris.

Oracle bought Sun and killed OpenSolaris. There is a continuing community fork called illumos. OpenIndiana is a distro of illumos.