FreeBSD

FreeBSD is a portable BSD branched from the 386 BSD release after the patchkits... FreeBSD has focused on delivering a solid i386 port, and a more focused user experience, later releases have included ports to other platforms.

• FreeBSD 1.0 GAMMA announcement
• FreeBSD 1.0 EPSILON announcement

So far I've only located FreeBSD 1.0 here the readme's file stamp is 11/23/1993, which would correspond with FreeBSD 1.0

funny history

• The name FreeBSD was on the tip of their tongues...
• maybe the first time Free BSD was used...?