Twin directories of OS:

[DIR]  ftp://ftp.heitec.net/repo/src/contrib/sendmail/BuildTools/OS/
[DIR]  ftp://ftp.galaktika.spb.ru/GAL712/OS/
[DIR]  ftp://208.209.50.19/pub/.vol02/NetBSD/NetBSD-release-3-1/src/gnu/dist/sendmail/devtools/OS/
[DIR]  ftp://ftp.estpak.ee/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/sendmail/devtools/OS/
[DIR]  ftp://ftp5.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/gnu/dist/sendmail/devtools/OS/
[DIR]  ftp://ftp.cesnet.cz/MIRRORS/www.apache.org/dist/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.cesnet.cz/MIRRORS/www.apache.org/dist/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.galaktika.ru/pub/education/DATA/NEW/OS/
[DIR]  ftp://ftp.bme.hu/OS/
[DIR]  ftp://ftp.cesnet.cz/.vol/backup/MIRRORS/www.apache.org/dist/perl/mod_perl-2.0.3/xs/APR/OS/
[DIR]  ftp://ftp.cesnet.cz/.vol/backup/MIRRORS/www.apache.org/dist/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://ftp.ntut.edu.tw/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.cs.uni-bonn.de/pub/mirror/apache/perl/mod_perl-2.0.4/xs/APR/OS/
[DIR]  ftp://zoffy.asahi-net.or.jp/pub/lang/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.kddlabs.co.jp/21/lang/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp5.freebsd.org/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.thquast.de/mirror/ftp.funet.fi/pub/languages/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.ruhr-uni-bochum.de/.subdisc1/mirrors/ftp.funet.fi/pub/languages/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.sg.freebsd.org/d/a/cpan.org/authors/id/O/OS/
[DIR]  ftp://ftp.pop-mg.com.br/data/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.utoronto.ca/mirror/packages/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.in2p3.fr/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.otenet.gr/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.uoregon.edu/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.ucr.ac.cr/pub/Unix/CPAN/authors/id/O/OS/
[DIR]  ftp://208.209.50.19/pub/perl/authors/id/O/OS/
[DIR]  ftp://ftp.muni.cz/pub/perl/authors/id/O/OS/
[DIR]  ftp://ftp.linuxforum.net/pub/www/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.cgu.edu.tw/pub3/Mirror/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.uniroma2.it/{C/CPAN/authors/id/O/OS/
[DIR]  ftp://202.18.64.24/pub/lang/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.onenet.net/mirrors/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.loxinfo.co.th/pub/cpan/authors/id/O/OS/
[DIR]  ftp://ftp.funet.fi/pub/languages/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.funet.fi/pub/languages/perl/backpan/authors/id/O/OS/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/unix/perl/authors/id/O/OS/
[DIR]  ftp://ftp.cosy.sbg.ac.at/pub/mirror/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.quicknet.nl/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.uni-siegen.de/pub/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.kfki.hu/pub/packages/perl/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.eenet.ee/pub/cpan/authors/id/O/OS/
[DIR]  ftp://64.50.236.52/.1/cpan/authors/id/O/OS/
[DIR]  ftp://64.50.238.52/.1/cpan/authors/id/O/OS/
[DIR]  ftp://193.226.140.51/CPAN/authors/id/O/OS/
[DIR]  ftp://24.215.0.24/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.br.kernel.org/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.linux.hr/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.software.umn.edu/CPAN/authors/id/O/OS/
[DIR]  ftp://mirror.hiwaay.net/CPAN/authors/id/O/OS/
[DIR]  ftp://ftp.kulnet.kuleuven.ac.be/mirror/CPAN/authors/id/O/OS/