Rakuten, the company behind kobo, has always tolerated hacking their devices, so...

		listenfaster 4 months ago \| parent \| context \| favorite \| on: Quill OS: An open-source OS for Kobo's eReaders Rakuten, the company behind kobo, has always tolerated hacking their devices, so there are several options, including KOReader, Plato and the subject here, Quill. Personally I think Kobo is your best option, if i understand your ‘open OS’ requirement.

Not anymore! They've recently moved to closing their devices with signed firmware