Titan FTP Server is a powerful secure multi-threaded FTP Server for Windows. Since Titan FTP is a fully multi-threaded Windows application, you can setup multiple servers all running simultaneously on different IP address/port combinations. Features secure file transfers using SSL; Virtual Folders; user based access; file & directory permissions, disk quotas, UL/DL ratios, bandwidth throttling, local and remote administration, detailed logging.

RaidenFTPD
A full featured & secured ftp server with many advanced functionalities such as SSL , 64-bit addressing , scripting interface and of course , full sets of FTP commands support

LiteFTP
LiteFTP is a feature-packed FTP server with transfer statistics and integrated DynDNS and No-IP dynamic DNS clients.

Ability FTP Server
Advanced, secure and easy to use FTP Server. Featuring remote admin, security protection options, disk quota limits, bandwidth restrictions, IP restrictions, virtual folders, resume support, real time activity viewer, real time control and much more.

Easy File Sharing FTP Server
Easy File Sharing FTP Server is a very easy to use FTP Server that allows visitors to download/upload/remove/create files/folders easily through a Web Browser (Internet Explorer, Mozilla) or an FTP Client such as CuteFTP.

GuildFTPd
GuildFTPd has autobanning, an events manager, IRC support, plugin support, virtual file system, passive IP port selection to be used behind routers, buffer size control, remote administration via site commands, and much much more.