ftp://ftp.mtu.ru/.4/NetBSD/NetBSD-release-3-1/src/dist/pcc/os/  direct

[DIR]CVS/  direct  1000+ twin directories
[DIR]freebsd/  direct  1000+ twin directories
[DIR]linux/  direct  1000+ twin directories
[DIR]netbsd/  direct  800+ twin directories
[DIR]darwin/  direct  540+ twin directories
[DIR]openbsd/  direct  260+ twin directories
[DIR]dragonfly/  direct  39 twin directories
[DIR]mirbsd/  direct  31 twin directories
[DIR]none/  direct  200+ twin directories