While the command-line interfaces are appreciated by many users, others prefer a graphical user interface (GUI), which is provided by the TPP GUI called Petunia. The GUI is web-based with client-side JavaScript to enrich the interface, allowing users to use the TPP from any web browser on any platform. Petunia has the advantages that the same exact GUI is available on a modest Windows laptop, a powerful expandable Linux server shared by a research group, or a remote cloud computing instance running on Amazon Web Services (AWS).