Solaris

OpenSolaris

https://en.wikipedia.org/wiki/OpenSolaris

illumos

https://en.wikipedia.org/wiki/Illumos

https://wiki.illumos.org/display/illumos/illumos+Home

OpenIndiana

https://en.wikipedia.org/wiki/OpenIndiana

https://www.openindiana.org

NexentaStor

https://en.wikipedia.org/wiki/NexentaStor

https://nexenta.com

SmartOS

https://en.wikipedia.org/wiki/SmartOS

https://www.joyent.com/smartos