The OS of Kobo is Linux (those in the know: please don't let this thread derive into a kernel&userland discussion).
No X11. The Kobo framework (also proprietary, closed source) uses Qt (earlier monikers were "Qt embedded") as the UI framework. As does KSM and Coolreader/other vlasoft applications.
Note that neither me nor anyone else promised to put work into this. I was discussing basic facts related to what you asked for. You can of course try, but I'm not convinced the author would be interested in putting much work into this. Well - open sourcing her/his application at least brings the potential to make the application available to a larger audience. No guarantees that will ever happen, though.
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