FreeBSD 4.x was considered by many as the most stable FreeBSD ever.<p>Mainly because there were 11 point releases of fixes and enhancements (4.11), as opposed to today where FreeBSD major version only have 3-4 point releases.<p><a href="https://www.freebsd.org/releases/" rel="nofollow">https://www.freebsd.org/releases/</a>