Alpha and Omega Minstries -- Christian apologetics primarily addressing Mormonism, Jehovah's Witnesses, and Roman Catholicism.
http://aomin.org/

American Vision -- Offering biblical solutions to society's current issues and problems.
http://americanvision.org/

Answers in Genesis -- Pertinent information dealing with creation, evolution, and biblical authority.
http://answersingenesis.org/

Biblical Horizons -- Applying the Lordship of Jesus Christ to the church.
http://biblicalhorizons.com/

Canon Press & Book Service -- Select literature for growing in Christian faithfulness.
http://www.canonpress.org/

Center for Reformed Theology and Apologetics -- Reformed Christian literature online.
http://www.reformed.org/

Center for Cultural Leadership -- Creating a new kind of Christian.
http://www.christianculture.com/

Chalcedon Foundation -- Pressing the crown rights of Jesus in all spheres of life.
http://chalcedon.edu/

Christian Apologetics and Research Ministry -- Tools for defending the faith.
http://www.carm.org/

Credenda/Agenda -- Explores all areas of life from a biblical, classical Protestant perspective.
http://credenda.org/

Council on Biblical Manhood and Womanhood -- Helping the church deal biblically with gender issues.
http://cbmw.org/

Covenant Home Curriculum -- Homeschool curriculum from a classical and Christian perspective.
http://covenanthome.com/

Covenant Media Foundation -- Excellent resources for sound biblical training.
http://www.cmfnow.com/

Cumberland Valley Bible Book Service -- Christian books and Bibles at discount prices.
http://cvbbs.com/

Faith Defenders -- Defending the Christain faith, with an emphasis on Islam.
http://www.faithdefenders.com/

Fire and Ice: Puritan and Reformed Writings -- A treasury of puritan and reformed writings.
http://www.puritansermons.com/

Free Books -- Over 90 free books and over 800 free newsletters for building a Bible-based Christian worldview.
http://freebooks.com/

Frontline Fellowship -- Working for reformation and praying for revival in the war zones of Africa.
http://www.frontline.org.za/

Geneva -- A comprehensive index of Reformed web sites.
http://geneva.founders.org/

Hall of Church History -- Theology from a bunch of dead guys.
http://www.gty.org/~phil/hall.htm/

Heal our Land Ministries -- Information on functioning as a free-church as opposed to a state-church.
http://www.hushmoney.org/

ICLnet Guide to Early Church Documents -- Documents from the early church online.
http://www.iclnet.org/pub/resources/christian-history.html

International Christian Concern -- Promoting religious liberty and assisting believers persecuted for their faith.
http://persecution.org/

Ligonier Ministries -- The teaching ministry of R.C. Sproul
http://www.gospelcom.net/ligonier/

National Reform Association -- Seeking to maintain and promote Christian principles in our national life and civil government.
http://www.natreformassn.org/

Patriarch -- Equipping men to be godly leaders in family, church, and society.
http://patriarch.com/

Reformation Documents -- Documents from the Protestant reformation online.
http://www.mun.ca/rels/reform/reform.html

Spurgeon's Archive -- Resources from the ministry of Charles H. Spurgeon.
http://spurgeon.org/

The Biblical Examiner -- Examines current issues in light of God's Word.
http://www.biblicalexaminer.org/

The Highlands Study Center -- Helping Christians live more separate, simple, and deliberate lives to the glory of God and for the building of His kingdom.
http://www.gospelcom.net/hsc/

Touchstone -- A Journal of Mere Christianity
http://www.touchstonemag.com/

Veritas Press -- Quality tools for a classical Christian education.
http://www.veritaspress.com/

Vision Forum -- Resources and products for rebuilding Christian family and culture.
http://visionforum.com/