OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
Serv-U Managed File Transfer Server - Comprehensive security, automation, and control over file transfers in and outside your organization
Dropbear SSH Server and Client - Dropbear is a relatively small SSH 2 server and client.
zFTPServer Suite - zFTPServer Suite is a user friendly and easy to use FTP server.
MobaSSH - Enhanced SSH server for Windows with Unix tools and much more
CompleteFTP by EnterpriseDT - CompleteFTP is a secure FTPS and SFTP server for Windows.