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Vote for Pure-FTPd
Pure-FTPd is a free (BSD), FTP server based upon Troll-FTPd. The server can run with privilege separation for paranoid security. It can even run 100% non-root, with its built-in chroot() emulation and virtual accounts. Transmission of cleartext passwords and commands can be avoided: Pure-FTPd has optional support for an SSL/TLS encryption layer using the OpenSSL library.
The same source code compiles and runs on Linux, OpenBSD, NetBSD, FreeBSD, Solaris, Tru64, Darwin, Irix and HPUX. Pre-built binary packages are available for SuSE Linux, Mandrake Linux, PLD Linux, Stampede Linux, Slackware Linux (Slimslack), Multilinux, Sorcerer Linux, Fli4L (the one-disk router), ROOT Linux and Gentoo Linux. Pure-FTPd is also available in port collections : FreeBSD (/usr/ports/ftp/pure-ftpd/), OpenBSD (/usr/ports/net/pure-ftpd/), NetBSD (/usr/pkgsrc/net/pureftpd/), Crux Linux (/usr/ports/contrib/pure-ftpd/) and Gentoo Linux (/usr/portage/net-ftp/pure-ftpd/) . Pure-FTPd is part of the following operating system by default : EkkoBSD