free open source windows ftp client?

[datiswous]

I had a bad experience some years ago with Cyberduck (in Windows), not reliable in uploading all files. Might have been fixed by now.

You could use NppFTP, plugin for Notepad++, works also for normal file uploading (I mean not only files opened in editor). Not sure if it's an improvement over Filezilla though.

What do you want to see improved?