Xiphos (formerly known as GnomeSword) is a Bible study tool written for Linux, UNIX, and Windows...that is a feature rich program for reading, study, and research using modules from The SWORD Project and elsewhere. It is open-source software, and available free-of-charge to all.
Another good program is The Word which consists of the main program (engine), and a list of add-on modules like Bibles, in different languages, commentaries, dictionaries, books, maps, fonts, different translation files, etc.
If you are Jewish then The Jewish Week has an article titled What Are The Top Jewish Apps? HERE that are available. Rabbi Miller also has an article titled New Tanach App for Android Has All the Bells and Whistles that is worth checking out.