Because, as the old saw goes GUI != better, many (particularly experienced) users still prefer to interact with their computer through it’s shell, via the console or a terminal emulator. As discussed earlier this month, the GNU Project has developed hundreds of programs for doing just about anything imaginable with a computer, but where GNU really shines, is in the development of command-line apps. Two of its most productive apps, for financial use, are: GNU PEM, a personal expense manager and Oleo, a spreadsheet.