Publisher Summary This chapter discusses applications of an open source desktop. The major application of open source desktops are graphical desktop, web browsers, office programs, professional applications (graphics, database front ends, Web designers), and personal applications (media players, games). A complete open source desktop with applications can be easily installed and demonstrated on a typical personal computer using Linux. These desktops are attractive, powerful, and easy to learn from scratch as Windows. Such desktops can be significantly less expensive than closed code systems, since they can save the operating system cost plus the cost of applications such as Microsoft Office. There is a possibility to build a desktop on Windows, where all the applications are open source. In situations where the operating system is already installed, such as on home computers, there is no savings to replace it with Linux, but there are huge cost savings from replacing applications such as Office with open source.