Windows Explorer integration for SFTP directories. Raw and simple. GPL-3.0 license. Enjoy.
This is a WPF application that can run in the background and synchronize one or more directories on your system with a remote SFTP server's directory.
It behaves kinda like dropbox, except it doesn't handle conflicts at all (the newest writer wins).
Makes use of WinSCP and its PowerShell interface for contacting the server and synchronizing.
Example setup of an SFTP server + DirSyncSFTP:
https://www.youtube.com/watch?v=G_cSS9fiq_o
FTPS variant: https://github.com/GlitchedPolygons/DirSyncFTPS