Well, you could make a webapp as a shell script within my WebPortal mod (it comes with some sample apps such as a notepad). But this only works with WiFi on and you have to contend with the Kobo's webbrowser.
I have some remote plans to extend my pngshow program (which currently only displays static images) into something that could be used to make interactive things from the shell; kind of like what zenity does for simple dialogs. But I don't know if/when I'd get around to that, it also depends on when I'd need such a thing for my own mods I guess.
So far apart from WebPortal none of my mods have GUI components really, except for AutoShelf which you can turn off/on with a simple tap anywhere on the screen. So lacking a real GUI, I'm currently going for very simplistic alternatives.
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I wanted something that I could share with other users without the need of extra language / libraries installations.
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For the smallest footprint you'd have to stick to C/C++ and use the libraries already present on the Kobo.