In some cases we've been building tools that are specific to Linux for the desktop, and they only work on Linux, but I see two major projects that are wildly, wildly successful: Mozilla and OpenOffice, and those two programs are cross platform.
“The greatest blessing of our democracy is freedom. But in the last analysis, our only freedom is the freedom to discipline ourselves.”
“It will be quite satisfactory if you open them gradually, as the circumstances may require; but the President assures you that this will not be the case if you make a treaty with England first.”