Kindle Lite
The selection of books is driven by my library, but even then the selection is pretty good. The app itself is great. Ive never had it crash and it lets me do everything I need; dim the background, change the background color, change font size. Sometimes I think I can get it to give word definitions but other times not, but that could very well be user error. Im impressed with the app and the service, especially considering its free.
mesheall about
cloudLibrary by Bibliotheca, v3.1.5