Hi,
I believe that Calibre is GPL'd and it has a built-in reader/viewer for many types of ebooks including pdb, epub, mobi, etc. I believe the only requirement is python 2.7 and access to Qt4. I am not sure if either of those are available under Android (probably not) but someone could use them as a basis for a multi-reading GPL'd tool if they could port the python code to java (or whatever language Android needs).
Just a thought.
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