Nautilus is a program which allows two parties to securely communicate using modems or TCP/IP. It runs from a command line and is available for the Linux and Windows operating systems. The name was based upon Jules Verne's Nautilus and its ability to overcome a Clipper ship as a play on Clipper chip. The project had to move their web presence by the end of May 2014 due to the decision of Fraunhofer FOCUS to shut down the developer platform that hosted the project.