Oyster is an on-demand e-book service every voracious reader should have.

Dubbed the "Netflix for E-books," Oyster is a digital library that contains over 100,000 books for browsing. Available for the iPhone & iPad, the system requires a $9.95 monthly fee in order to download and read this extensive collection. Books can be synced between devices but it emits features like a bright light for reading in the dark. The fee is a small price to pay for the numerous options encased within this application.

Price: $9.95

Available: iPhone.