This software was originally derived from William F. Jolitz's 386BSD release 0.1, though almost none of the original 386BSD specific code remains. This software has been essentially re-implemented from the 4.4BSD-Lite release provided by the Computer Science Research Group (CSRG) at the University of California, Berkeley and associated academic contributors.

There are also portions of NetBSD and OpenBSD that have been integrated into FreeBSD as well, and we would therefore like to thank all the contributors to NetBSD and OpenBSD for their work.