I have been a long time user of e-Sword (alongside BibleWorks and now also Logos, for which there is also a free version available) and cannot recommend it highly enough. It is a free Bible study software program that rivals many that you would have to pay for and is better than most. This program also makes basic word studies a breeze and has been of great use to those in my congregation to whom I have recommended it. In fact, they often tell me that they love the layout and how user-friendly the program is. There is not a very steep learning curve with this program, so most anyone can catch on to it fairly quickly. The most recent update is version 12.0.1. Here is a description of the most recent updates:
New Low Light display setting to make viewing the text easier on your eyes.
New App Themes to further customize the e-Sword interface to your liking.
Hundreds of refinements throughout the app, including a rebuilt STEP Reader, improved Resource Options dialog and bulk printing/copying of Journal Notes in date ranges.
For those interested, here is a history of updates going back to version 5.
I wish they would develop an Android version. I use E-sword on my desk top, but Id love to have it on my Galaxy phone and tablet.
Yeah. I only see one for the iPhone, but you could try this one: https://mysword.info/
It is what a lot of e-Sword users like who have an android phone. There are also many modules available for it here: http://www.biblesupport.com/e-sword-downloads/category/26-mysword-modules/