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Elmer Towns.com has helpful resources for church growth, Sunday school, Christian education, Bible study and exposition, and Christian life. The books are available in PDF format and can be downloaded for free.
Project Gutenberg is one of the oldest producer of free e-books. You can search for Christian books on their website. The New Testament and Old Testament (KJV) are there too.
ChristArt has more than ten Christian books they made available on their website for online reading and free downloading. Most books are for children and can be used in pre-school and elementary Sunday school class.
Christian Classics Ethereal Library
CCEL has a list of Christian writings they made available for everyone to read online. You can do research, study, read, or meditate with the daily devotion. All these you can do on their website.
Worthy Christian Library
Worthy Christian Library has hundreds of Christian books you can read online. Books are arranged alphabetically and according to author.