Below are some resources that you can use for more in-depth Bible study.
STEP 2.0 Bible is a free online Bible study resource that has been designed by Tyndale House of Cambridge University. They are known for being a great scholarly resource for many who are doing their post graduate studies. I was able to test drive it a bit and I find that it is a very powerful tool that is easy to use. In addition it gives you the ability to search a number of commentaries.
For most, using this resource in conjunction with the other free software such as "E-sword" (www.e-sword.net), and "Online Bible" software (onlinebible.net) really can fill out your bible study library. These are great for laptops when you may not have internet access.
My personal favorite is "Blue Letter Bible" (www.blb.org) and I use it a lot when doing my own personal studies as well as when I am doing research for the Wednesday and Sunday teachings. Don't forget the other great online resources such as "Bible Hub" (biblehub.com), and "Bible Gateway" (biblegateway.com).
Check them out and if you like them, add them to your library.