OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
SFTPGo - Fully featured and highly configurable SFTP server with optional HTTP/S, FTP/S and WebDAV support - S3, Google Cloud Storage, Azure Blob
Bitvise SSH Server (WinSSHD) - WinSSHD is our SSH server for all Windows NT-series operating systems.
Dropbear SSH Server and Client - Dropbear is a relatively small SSH 2 server and client.
CerberusFTP - Cerberus FTP Server 8 The secure and reliable file transfer solution that you control.
CompleteFTP by EnterpriseDT - CompleteFTP is a secure FTPS and SFTP server for Windows.