SVG has another interesting application: it can be used as a UI language for graphically rich and complex interfaces, almost game-like but not quite. You often see this kind of interfaces in audio, i.e. soft synths/effects. Though you will need to create your own extension to the markup and a subsystem that supports it in your OS, which in the end is not too complicated.

(Shameless self-plug as an example of an SVG-based GUI: https://itunes.apple.com/us/app/magnetola-vintage-cassette/i...)