Shoutbox

I agree with Choli and Raceprouk, but might add that you don't HAVE to make money out of it. You can also program for fun, and because you just did it for fun, why not share the fun with others and open-source it? And there is no company that makes linux. And linux companies make money out of support and nice manuals with the boxed versions. Big companies want support, so that if (for whatever reason) something goes wrong, they can just call someone.