*BSD's and other OS's missing. #64
Description
There are several BSD's missing, including OpenBSD (probably the most secure OS in the universe), and other Unices (pl. of Unix) like the illumos family. Non-Unices like ReactOS which tries to be a free Windows replacement, Haiku, KolibriOS. Just browse Wikipedia for a more complete list.
At least, if you mention FreeBSD, NetBSD and OpenBSD should be mentioned.
Allow me to include GhostBSD, NomadBSD and FuryBSD which are desktop friendly/live takes on FreeBSD. OS108 for NetBSD.
The BSD's have a truly free license compared to GNU's ones (the GPL's) which are free, but with restrictions (hence restrictive licenses, versus BSD's totally free, as in a gift, licenses).