EPUB3Reader (Android app)
This proof-of-concept Android app lets you easily read and navigate complex EPUB 2/3 eBooks (internal/external links, parallel texts). In the GitHub repo you can find the APK, the source code, screenshots and some EPUB eBooks with parallel texts.
This is an academic project, under active (if slow) development at the Department of Information Engineering of the University of Padova, Padova, Italy --- I co-mentor the students involved in the code development.
GitHub:
https://github.com/pettarin/epub3reader/
MR thread:
https://www.mobileread.com/forums/sho...d.php?t=222054