There are many great websites that can help you do Bible word studies and such for free. Here are a few of my favorites. I especially like E Sword, which is a great free bible study software which allows you to download and use many different commentaries, dictionaries, bible studies, and bible versions. Did I mention that it is free?
ReGreek – specializes in word studies from the Bible ’s original languages.
Crosswalk – has many translations and Bible study tools.
Bible Gateway – has many translations and Bible study tools.
CCEL – has most of the major works from Christian history for free and a “Study Bible” feature that pulls up historical church commentary on specified verses.
E Sword – has numerous Bible study tools.