There are dozens, maybe hundreds of websites that offer free Bible studies. These are three that I found that look pretty good:
They give a huge list with comments on each course, but no overall remarks.
free-bible-study.org/ They say this about their site, "We have evaluated a massive amount of Bible Teaching from around the globe and distilled it down to this site, the best of the best in modern Bible Studies. Let us guide you on your quest for truth as it is recorded in the very words of God, the Bible."
topicalbiblestudylessons.com/ They just give categories and titles without comment. They appear to be presented in Microsoft Word format for easy editing should you wish to modify them.
Entering "free Bible study" into Google's search engine will present you with more links than you can ever look at. Be careful. Many of them are cult based or have a heavy agenda of their own.
So why should you be willing to pay for ours when there is so much free material available?
What sets our lessons apart is:
THE HOLY SPIRIT IS THE TEACHER
Each lesson gives the Holy Spirit space and time to influence the students.
THE BIBLE IS THE AUTHORITY
All the other Bible studies I have found seem to speak from their own knowledge, instead of just offering their knowledge, and letting you make up your own mind in prayerful consultation with the Teacher as you study the Bible.
We have tried to base the lessons on a simple generic statement of Christian faith.
Each lesson is usually only one sheet of paper. There are no books to manage. (except the Greek course.)
LESS LEADER PREPARATION
If you are using the lessons with a small group or in Sunday School, the group leader is just one of the students who happens to be responsible for keeping the discussion on track.
STUDENT INTERACTION AND PARTICIPATION
The questions are designed to maximize thought and prayer, and in a group setting this serves to increase student participation and discussion of the Bible passages.
Most lessons have additional optional material.
Most courses can be used by a group or as a self-study as well as with a pen pal ministry.
Many of the illustrations are in color, but they can be printed and copied black & white if necessary and still look fine.
If you are using these lessons with someone behind bars they are completly free of charge or fee of any kind. If you are using them out here in the free world, you can pay whatever you think it is worth. (Remember if you are in some kind of prison ministry, everything is free for your use.)