FileZilla Server is described as 'Sister product to FileZilla Client, is an FTP server that supports FTP and FTP over SSL/TLS (FTPS). FTP over SSL/TLS provides secure encrypted connections to the server' and is a popular FTP Server in the file sharing category. There are more than 25 alternatives to FileZilla Server for a variety of platforms, including Windows, Linux, Mac, BSD and Self-Hosted apps. The best FileZilla Server alternative is copyparty, which is both free and Open Source. Other great apps like FileZilla Server are SFTPGo, CrushFTP, vsftpd and ProFTPD.