Look to figure out what is it: https://docs.openindiana.org/misc/openindiana/

To be short, it is opensource implementation of SUN Solaris OS. I don't know if it is already developed much.

I am honestly really surprised at the number of comments from people who didn't know what it was.

I did a sort of review 3Y ago. It may throw some light:

https://www.theregister.com/2022/12/07/new_version_of_openin...