FreeBSD
A Unix operating system built on the Berkeley Software Distribution code that was the first Unix freed from AT&T licensing. It comes with the BSDLicense, which historically only required that you disclose that you had adapted BSD code if you take it.
Other common BSD distributions include OpenBSD and NetBSD.
BSD manual pages can be accessed online at http://www.openbsd.org/cgi-bin/man.cgi
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