Twin directories of usr.bin:

[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/5.0-CURRENT/src/secure/usr.bin/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/2.1-STABLE/src/eBones/usr.bin/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/2.1-STABLE/src/secure/usr.bin/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/2.2-STABLE/src/secure/usr.bin/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/3-STABLE/src/secure/usr.bin/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/4-STABLE/src/secure/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/tools/regression/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/secure/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/eBones/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/gnu/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/kerberos5/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/kerberosIV/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/cddl/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-release-4-0/src/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-release-4-0/src/regress/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-release-4-0/src/sys/arch/x68k/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-release-4-0/src/gnu/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/sys/arch/x68k/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/gnu/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/regress/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/external/bsd/atf/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/external/bsd/pcc/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/external/gpl3/binutils/usr.bin/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/external/apache2/mDNSResponder/usr.bin/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/openbsd/src/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/tools/regression/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/gnu/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/kerberos5/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/kerberosIV/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/secure/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/eBones/usr.bin/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/cddl/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-4-0/src/sys/arch/x68k/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-4-0/src/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-4-0/src/gnu/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-4-0/src/regress/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/sys/arch/x68k/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/regress/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-0/src/sys/arch/x68k/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-0/src/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-0/src/gnu/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-0/src/regress/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/src/sys/arch/x68k/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/src/usr.bin/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/src/regress/usr.bin/