The GPL license offers the end user the full liberty to share and modify the software. Cyberdunk is licensed under General Public License (GPL) � the globally famed free software license. Unfortunately, the program does not have a Linux version. The multi-functional client is a cross-platform client that supports both operating systems � Mac and Windows, but primarily, it is more common among macOS users. Since its release, it is one of the most popular FTP clients in the market for macOS. The program is coded in Java and C# and leveraging the Windows Forms, and Cocoa user interface for Windows and macOS respectively. 1.4.3 Quick Connection to Various Servers.1.2 How to Download Cyberduck for Windows.