Ftp4all
Ftp4all
http://www.ftp4all.de/
Nanoftpd
Nanoftpd
http://nanoftpd.sourceforge.net/
Oftpd
Oftpd
http://www.time-travellers.org/oftpd/
Proftpd
The official proftpd web site. proftpd is a high-performance, extremely configurable, and most of all a secure ftp server, featuring apache-like configuration and blazing performance.
http://www.proftpd.org/
Vsftpd
Secure, fast ftp server for unix systems
http://vsftpd.beasts.org/