ExaVault - ExaVault is your Secure Cloud FTP platform -- trusted by over 5,000 companies from Adobe to Zillow. Instant setup for manual and automated transfers with a full web interface and direct FTP, FTPS and SFTP support.
FileZilla Server - Download FileZilla Server 0.9.60.2 for Windows
SmartFile - Secure file sharing & FTP hosting for the enterprise.
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.
FTP Today - FTP Today offers private and secure file transfer/sharing via a hosted Software-as-a-Service model.
vsftpd - Very secure FTP Daemon, a secure, fast FTP server for UNIX systems, including Linux.