ColoradoFTP Server - http://cftp.coldcore.com/
Open source server fully compatible with RFC 959 and 3659, written in Java. Site includes documentation and links to an online demonstration server. |
CrossFTP Server - http://www.crossftp.com/crossftpserver.htm
Free secure FTP Java server with screenshots, manual, and forum. |
Pure FTP Server - http://www.pureftpd.org
A free (GPL) secure FTP server for Unix, Linux and MacOS X. |