Blue Letter Bible is a very user friendly app that allows you to explore the original languages and the depth of meaning. There are also multiple commentaries, audio and video resources, and other tools. 

YouVersion has multiple versions available in multiple languages. It also has an excellent audio option. One of the best features is the reading plans which can be used individually or by groups for accountability and community Bible study.

Precept Austin is a powerful resource for the serious Bible student. 

Bible Gateway has developed one of the most useful Bible websites and apps. It is very easy to navigate.  

Olive Tree contains great reading plans and you can sync your notes and study highlights.

Logos is the best there is and top of the line Bible software. It's also expensive, but it has different levels that are more affordable.  Their app is available for iPhone, iPad, Android, Kindle, Windows, Mac, and Biblia.com. With easy social sharing buttons, you can share verses across social media. The Greek and Hebrew word comparison in the Logos app is really fabulous for in-depth Bible study.