I second this. It is very easy to run custom software on Kobos (at least the Kobo Aura HD I have). Executables built with the cross-compile tool chain shipped w

I second this. It is very easy to run custom software on Kobos (at least the Kobo Aura HD I have). Executables built with the cross-compile tool chain shipped with Debian work flawlessly on the device. The screen can be easily used with the provided /dev/fb0. The reader also acts as a virtual USB network device, so you don't have to rely on a clumsy WiFi connection. Another plus (at least for older models) is that the devices are quite easy to open and that the internal storage is just a normal removable micro SD card. So you can't really brick your device. All in all it took me a few hours to write a simple application which renders the current time and date with a TTF font to the display.