I have really been enjoying the Scripture Plus app, which adds videos, graphs and all kinds of explanatory background to the Book of Mormon.
This app is brought to you by the same people who do the Book of Mormon Central videos, which I have been enjoying for several years. The videos are tied into the app, so you can read the scriptures and then do further study.
One of the things I have found in the Come Follow Me program is that my children who are still at home (ages nine to 14) really enjoy understanding the context of the scriptures. Believe it or not, my kids will discuss the scriptures for more than an hour if we can talk about the history involved and other details, other than just reading the scriptures. And the Scripture Plus app helps you do that.
So check it out here.