I’m reading about JADE on your web and I wonder if Jade is only a (FTP, SFTP, FTPs) client or if it has a server part?
JADE is only a client. You can use it with any of the FTP/SFTP/FTPs servers that are freely available on the Internet.
If you've not already read it, you may find our JADE slide presentation provides a useful overview of JADE and its use.