GNU/Linux - Friendly Linux Forum
Haiku - Haiku is an open source OS catered specifically to the needs of personal computing.
SUSE Linux Enterprise - SUSE is the original provider of the enterprise Linux distribution and the most interoperable...
Xubuntu - Xubuntu – Xubuntu is an elegant and easy-to-use operating system. Download XubuntuXubuntu – Xubuntu is an elegant and easy-to-use operating system. Feature Tour.
Enso OS - A clean and simple OS that is easy to use and incorporates some of our favourite projects from around the Linux world.
Illumos - Illumos is a derivative of OS/Net (aka ON), which basically is a Solaris/ https://alternativeto.