Originally Posted by MyBBplaybookJS
Foggynight if you are referring to non DRM books you need a third party app. The best of which available as a native app (and I avoid android ported apps like the plague they are) is Book Reader. There are a number of websites that have public domain books available free for download. There are also a number of sites that offer DRM free books.
Every site that is known to us is listed in the wiki. If you find more add them in. Note the free page is for sites that have only free eBooks while the store page includes the possibility that there are free books on the site as well as ones that cost money.