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I don't think there are any. However, you easily can install alternative readers on Kobo ereaders, see here for a list of some hacks: https://www.mobileread.c

• PyroLagus 7y ago
  There's the BQ Cervantes, which runs FOSS software, but Kobo's open source community seems much more active. https://github.com/bq/cervantes https://github.com/bq/cervantes https://blog.bq.com/es/bq-ereaders-developers-program/ https://blog.bq.com/es/bq-ereaders-developers-program/