Aldiko Book Reader application is a central place for you to read, shop and organize eBooks. Use it to browse and download from thousands of FREE classics and modern works and read them right on your Android Smartphones and tablets. Forget about carrying around heavy stack of books, your whole library is with you all the time.
CoolReader - an open-source program for reading electronic books in a variety of formats for Windows and Linux. There are also versions for OS Android and e-reading devices (LBook, PocketBook)