It's crazy that we are over 15 years removed from when illumos officially started as a project, shortly after Oracle took over Sun and killed off OpenSolaris.

I was on the group call that made the announcement in 2010 and I'm impressed that illumos is still going strong.

Fun fact, it is the only open-source OS that is proper UNIX (SVR4), not Unix-like, like the BSDs or Linux.