http://www.carm.org/comparison-between-christian-doctrine-and-mormon-doctrine (This is a good doctrinal comparison of Mormonism and Christianity.)
http://www.lifeafter.org/ is a remarkable website, done by ex-Mormons to lead Mormons to “the real Jesus.” Note the testimonies of former Mormons and the extensive documentations of why you should come to Christ and leave Mormon church.
http://www.apologeticsindex.org/b60.html is a good website on Mormonism.
Mormon Quotes. This website was designed to help you find historical quotes from prophets, leaders and members of The Church of Jesus Christ of Latter-Day Saints. You can perform basic or advanced keyword searches or just browse the knowledgebase by topic.
The Mormon Illusion: What the Bible Says About the Latter-Day Saints by Floyd McElveen
Answering Mormons' Questions by Bill McKeever
Mormonism Unmasked by R. Philip Roberts
Reasoning from the Scriptures with the Mormons by Ron Rhodes
Christian Ministries with Outreach to Mormons:
Nauvoo Christian Visitor's Center (http://nauvoochristianvisitorscenter.org/). The Nauvoo Christian Visitors Center (NCVC) in downtown Nauvoo, Illinois, exists to defend Christianity against the charges made against it by ‘The Church of Jesus Christ of Latter-day Saints,’ more commonly known as ‘The Mormon Church.’ NCVC’s mission is to evangelize Mormons, educate both Christians and non-Christians about the teachings of Mormonism, and encourage those who have left Mormonism to come to a saving knowledge of Jesus Christ, the Jesus of the Bible.
Concerned Christians (http://concernedchristians.com/) is a non-profit organization of Christians who have a desire to reach out in love to the Mormon community with the truth of God's Word, the Holy Bible.
Mormonism Research Ministry (http://mrm.org/). A missionary/apologetics organization that was organized to propagate the Gospel of Jesus Christ and to critically evaluate the differences between Mormonism and biblical Christianity.
Utah Missions: A Ministry of Watchman Fellowship (http://www.watchman.org/) is a Christian Apologetics ministry that began in 1954 for the purpose of educating and equipping Christians to effectively share their faith with their Latter-day Saint friends and family.
Recover from Mormonism. (www.exmormon.org) This is a solid resource for Mormons in transition. Talk to other Mormons on their message board and browse their great list of resources.
Saints Alive in Jesus (http://www.saintsalive.com/) is an evangelical “Apologetics” group headed up by Ed Decker, author of such books as The God Makers and Decker's Complete Handbook on Mormonism, generates research and study material, comparing cult groups with orthodox Christianity. While their major ministry areas deal with Mormonism and Freemasonry, you will find numerous other groups and issues covered here as well.
Through the Maze Ministries (http://www.mazeministry.com/). Jim Spencer has been an evangelical minister for over 25 years. He is also a former Mormon Elder who has spent a great deal of time writing and teaching about Mormonism. His website is a great resource for anyone looking for information on the subject, or just to get an idea of what really is going on inside those big buildings.
Word for the Weary—Questioning Mormonism (http://answeringlds.org/). This is a non-profit Evangelical Christian organization. Founded in 1989, their primary purpose is to share the truth of Jesus Christ with those questioning the validity of The Church of Jesus Christ of Latter-day Saints.
The Official Website of Utah Lighthouse™ Ministry (http://utlm.org/), founded by Jerald and Sandra Tanner. The purpose of this site is to document problems with the claims of Mormonism and compare LDS doctrines with Christianity.
A Shield & Refuge (http://www.shieldandrefuge.org/). There are at least 30,000 people who are involved in Mormon fundamentalist sects that practice polygamy, or plural marriage. This website is a great resource of information on polygamy.
Living Hope Ministries (http://sourceflix.com/). They believe that the Mormons are exceedingly valuable to God; and because they affirm His love for Mormons, they too share that love, and that desire for them to know Him in spirit and truth.
MacGregor Ministries http://mmoutreachinc.com/mormons/mormon_index.html). This is a registered charity in operation since 1979 offering vital information on the cult groups from a Christian perspective. They believe if you have the right Jesus Christ, you are right for all eternity. But if you have the wrong Jesus Christ then you are wrong for all eternity.
Christian Apologetics & Research Ministry CARM (http://carm.org/) is a 501(c)3 nonprofit Christian apologetics organization whose purpose is to equip Christians with good information on doctrine, various religious groups (Mormonism, Jehovah's Witnesses, etc.), cults, Evolution, New Age, and related subjects.
Darkness to Light (a ministry of Christ Community Fellowship) (http://www.dtl.org/index.html). This church is a member of the Evangelical Free Church of America. Gary F. Zeolla is the founder and director of Darkness to Light.
What is Mormonism (http://www.whatismormonism.com/). This provides information about the Origin of the Book of Mormon, Mormon Theology, LDS Historical Research, Mormon History, and Joseph Smith.
Truth In Depth (http://truthindepth.com/) produces special audio reports on compact disc for Christian study groups, Sunday School classes, churches and personal listening. They also tell stories of real life. And in the process seek to deepen their understanding of relevant issues and questions that have significant implications for our faith. They do so by thoroughly examining the evidence and finding out what the experts have to say. In short, they search for truth.
Equipping Christians (http://www.equippingchristians.com/) is an Evangelical Christian ministry that teaches and equips individuals, small groups and Bible studies about Mormonism. They offer pamphlets, brochures, audio and video tapes, flyers, and other items.
Mormons in Transition (http://www.irr.org/mit/). Unaltered, authentic Mormon history sponsored by the Institute for Religious Research.
Utah Partnerships for Christ (http://upfc.org/). UPFC’s vision is to train college and high school students to effectively reach the ever-growing Mormon population around the world. We train these students to speak the truth in love and to create opportunities for relationship building evangelism.
Witnesses for Jesus (http://4witness.org/) is a Christian ministry dedicated to sharing the good news of the eternal salvation in Jesus Christ. Our area of special focus is reaching the hearts and minds of Jehovah's Witnesses and Mormons.
Randy Alcorn (@randyalcorn) is the author of over sixty books and the founder and director of Eternal Perspective Ministries.