FTP software is an application or a client to connect you to the server or your domain online. You can use any ftp client to connect and upload your site and files. It is like a web browsers, you can use any web browser to access a site on. It's connect to the same site despite the names, colors or versions.
There are so many FTP applications online and many of them free. Some applications have an in build FTP you can use them or any other you have. Make sure you use correct credentials
