Each of the following indie apps makes it easy to load and consume universal (and DRM-free) EPUB and PDF book files directly on your phone, while providing slick interfaces in the process.

There are a variety of e-book types and plenty of file formats to deal with, and then there are different kinds of books (novels, comics, etc.) that make the whole experience a little complicated.

Kindle books are all in Amazon's proprietary e-book format of .AZW3 files. These files can only be read on Kindle devices, so if you want to read your e-books on another device — whether that be ...