BookGanga - eBook Reader is a multi functional tool that doesn't only allow you to open and read e-books, but it also helps you obtain, download, and organize such books. Anyway, you should keep in mind that this tool is meant specifically to handle Indian literature, so it will help you obtain mostly books in Indian languages like Hindi, Urdu, Sanskrit, Gujarati, Tamil or Punjabi, but there are also some books in English as well as World literature books available.
BookGanga - eBook Reader lets you search for specific books and purchase them right from its interface. It lets you download free e-books as well. The fact that it comes with an easy-to-use interface that even complete beginners can easily handle is one of its most important advantages. It's a good thing that it's also free especially since even its latest version still comes with some flaws that I've noticed a while ago, when testing some of its older editions. For example, it still takes quite a while to show results when scanning the free library. Furthermore, there's still the issue of books that were presented as free being in fact previews of commercial books. Unfortunately, with this tool, getting free books seems more like a game of guess. There are also issues with setting the app to a proper screen size when your display is using a rather large resolution, and with accessing the login window.
Anyway, despite the flaws and drawbacks, BookGanga - eBook Reader is an interesting tool that may still be worth a try, especially if you're interested in Indian literature.