For example an ftp client (Filezilla) able to recieve let say CuteFtp server and vice versa?
Dennis, Any FTP server and FTP client communicate with a standard protocol, the File Transfer Protocol. This means that any client and any server can be substituted into this system and both will work fine, as long as they use the FTP protocol. Filezilla and CuteFTP both would work fine with any brand. For an online FTP client, you might try https://fit.jupiterit.com. Its nice because there is nothing to download, so its easy and fast.