This is a list of stand-alone SFTP servers. If you want to write an application that acts as a SFTP server, see the list of SFTP server components instead.

Minimalist SFTP servers

Good for quick & dirty testing. (Almost) no configuration. Easy to setup and run.

Server Note
Rebex Tiny SFTP Server Free SFTP server from the authors of this site.
Core Free Mini SFTP server Note: search for "free mini sftp server" download link.

Full-featured SFTP servers

Software for heavy-duty file transfer.

Server Note
Rebex Buru Server - SFTP and SSH server Lightweight SFTP, SCP, SSH server for Windows from authors of this site. Free for non-commercial use.
OpenSSH The most widely used SFTP/SSH server on the planet. Perfect for Linux or *BSD, not so great on Windows. Open source.
Bitvise SSH Server SFTP/SSH server for Windows.
Tectia SSH Server Enterprise SFTP/SSH server from the creators of the SSH protocol.
CrushFTP File transfer server with support for SFTP, SCP, FTPS and HTTPS.
VanDyke VShell Server SSH2/SFTP/FTPS file transfer server for Windows, Linux & Mac with fine-grain access control and configuration.
GlobalScape EFT Server
Titan FTP Server SFTP, FTP/SSL and FTP server for Windows
Cornerstone MFT Secure MFT Server with clustering, PGP encryption and Active Directory
Core FTP server
Axway SecureTransport
Cerberus SFTP
Wing FTP Server
Serv-U MFT Server
WS_FTP Server Corporate
JScape MFT Server MFT server with SFTP support written in Java.
GoAnywhere MFT MFT server with SFTP support.
Syncplify SSH2, SFTP and FTPS server
CompleteFTP FTPS/SFTP/SCP/SSH server from EnterpiseDT
Copssh SSH and SFTP server for Windows based on OpenSSH and Cygwin with custom installer and admin UI
Powershell Server SFTP, SSH, PowerShell
SilverShield SSH and SFTP server for Windows
FTPShell Server FTP and SFTP server for Windows
SFTPPlus MFT server with support for SFTP, SCP, FTPS and HTTPS on Windows, Linux & UNIX
/n software SFTP server SFTP server for Windows. Free for non-commercial use.
Provide server A file server solution with SFTP support in some editions.
Xlight Windows FTP and SFTP Server
Couchdrop The simple cloud SFTP/FTP/Rsync server and API that works with cloud storage like Dropbox.
SFTPGo Opensource SFTP server with several storage plugins for Linux, macOS and Windows written in Go.