Digital modes require additional hardware and software to run, you will need a computer and one or more of the software packages listed below. This is by no means an exhaustive list, but does contain the more popular packages.
Ham Radio Deluxe which has become commercial software, previous versions were free. Supports most common digital modes. Runs on Windows platforms.
fldigi supports most common digital modes. Runs on Linux, Windows, and Mac OSX.
Fldigi is installed on the club field day computers.