Alfa Ebook is an Ebook manager and viewer. It supports PDF and EPUB file formats. from the developer website:
"It is an ideal tool for book-lovers, schools, clubs and business libraries. Using Alfa Ebooks Manager you can quickly scan your computer for book files, create structured ebooks library, update books information from the Web and even view books in 3D-space. You can find a book in your library in just a second by its title, author or ISBN."