Quedtion on open source software for keeping project in sync through SFTP

Hi all and thanks for taking the time to check this post of mine out. These days I'm taking inventory of my workflow as a developer. I'm pretty much vendor locked into PHPstorm but the only feature that I truly need is that it keeps my local project in sync with the remote file system for any website that I'm working on.
For all other intents and purposes Visual Studio Code is actually fine. So my question is: do you have recommendations for any freeware that does this exact same thing?

Thnx!