Plain and simple PDF/CBZ/CBR viewer with bookshelf functionality.
It's all free and source code is available on github.
Github: https://github.com/kurema/BookViewerApp
(Screenshot: Give My Regards to Black Jack/SHUHO SATO/Manga on Web)
PLEASE NOTE: We released BookViewr3 with a totally different user experience. Get it from
http://approjects.co.za/?big=store/apps/9N607JHLBCZB