Notepad++ is a GPL licensed source code editor for Windows operating system.
I use it rarely due to Linux related habits, but my friends are using it all the time, so there must be something about it. Taking this into account, I will briefly describe how to edit files using this editor over SSH File Transfer Protocol.

Open Plugins > NppFTP > Show NppFTP Window menu.

Select Settings > Profile settings in NppFTP Window.

Add new profile.

Provide a name for new profile.

Provide IP address, connection type and username. Close window afterwards.

Choose profile from Connect menu.

Enter password.

Access files on remote server.