5 links
Pure FTP Server
pureftpd.org
A free (GPL), featureful and very secure FTP server for Unix, Linux and MacOS X .
ShareIT for Windows
noisette-software.com
Secure ShareIT Server is a high-powered, easy-to-use FTP server for Windows Computers.
War FTP Daemon
jgaa.com
Highly configurable free FTP Daemon with security options. Platforms: Windows 9x and NT.
Winsock FTP Daemon
ftpd.com
wftpd is a basic FTP server with quite a bit of configuration options. Platforms: Window 3.x/95/NT.