We may receive a commission on purchases made from links. First launched in 2007, Amazon's Kindle is a popular series of e-readers for people who enjoy reading on the go. What makes these devices ...

A Kindle works fine on its own, but it becomes a lot more useful when you use it with select free apps. You can use things like Calibre, Libby, Send to Kindle, Instapaper, and StoryGraph to convert, ...