Apologetics

ABCs of Faith: Catholic apologetics and evangilization information, presented in a well-reasoned, balanced and lighthearted manner.
http://www.abcsoffaith.com/html/home.html
About Catholics: About Catholics aims to inform the general public, Catholic and non-Catholic alike, about the teachings of the Catholic faith. We also provide a place for people to gather in an online community to discuss your faith and life.
http://www.aboutcatholics.com/
American Catholic Truth Society: ACTS, the American Catholic Truth Society. An Internet source of Catholic Apologetics. Email lists, live chat channels, online debates and more!
http://www.americancatholictruthsociety.com/
Apologetics Toolkit: The aim of this page is nothing less than to communicate the person of Jesus Christ-- or, more precisely stated, to provide tools to help Christians to communicate the person of Christ. In Christian apologetics we can do nothing other than talk about Jesus Christ--outside of Christ, we Catholics have nothing. Christ is the basis of our faith, and once the world comes to know the burning love within his Sacred Heart, it can only be set ablaze with love.
http://www.columbia.edu/cu/augustine/a/
Bible Christian Society: The stated mission of the Bible Christian Society (BCS) is to convert at least 50% of the Greater Birmingham area to Catholicism by the year 2038, but the ripple effect reaches way beyond Birmingham. The website's purpose is to facilitate the distribution of the BCS evangelization/apologetics materials and ideas.
http://www.biblechristiansociety.com/
Boston Catholic Journal: Dedicated to promoting a genuine understanding of authentic Catholic doctrine that is totally faithful to the Holy See in Rome. This includes articles on vital issues by both Religious and Catholic laity. The site also promotes the use of Latin through free audio files and free CDs of Catholic prayers.
http://www.boston-catholic-journal.com/
Bridegroom Press: Providing orthodox catechetical and evangelization tools for adult use and for the instruction of children.
http://www.bridegroompress.com/
Catholic Answers: Catholic Answers is the largest Catholic apologetics and evangelization organization in North America. We are lay people devoting our full-time efforts to promoting the Catholic faith through books, booklets, tracts, This Rock magazine, tapes, and television and radio appearances. Our staff apologists answers questions about the faith and give parish seminars. Our catalog is one of the most comprehensive in the country.
http://www.catholic.com/
Catholic Champion: Catholic Champion is an apologetics website in which many authors contribute to the defense and understanding of the Catholic faith. The website is more oriented towards a Catholic journal type format.
http://www.catholicchampion.com/
Catholic Citizens of Illinois: Catholic Citizens of Illinois holds monthly speaker forums, publishes newsletters and articles on Catholic events, and actively defends the Catholic faith in the public square.
http://www.catholiccitizens.org/
Catholic Defense Directory: The Catholic Defense Directory is a collection of almost 9,000 links to articles that explain and defend Catholicism.
http://www.phatmass.com/directory/
Catholic Ex-Jehovah's Witnesses: Our Primary Goal is to Provide Reliable Resources to Catholics Who Would Like to Invite Their Jehovah's Witness Friends and Relatives to Come Home to the Fullness of the Christian Faith: The Catholic Church.
http://www.catholicxjw.com/
Catholic Faith and Reason Association: To explain the beauty and truth of the Catholic faith and dispel myths about it in accord with the teachings of the Magisterium of the Church. We are an apologetics site.
http://www.catholicfaithandreason.org
Catholic Nucleus: The Catholic Nucleus was created out of the need to catechise both Catholics and non-Catholics alike in the teachings of the Catholic Church.
http://www.catholicnucleus.com/
Catholic Response: Our aim is to disseminate, with the approval of the Local Ordinary, the Truths of the Catholic Faith in common but orthodox language by simple and inexpensive means, relying on the providence of God.
http://users.binary.net/polycarp/
Christifideles Pizza and Theology Society: We are lay Catholics loyal to the Holy See and the Church's Magisterium whose primary interest is Catholic apologetics and evangelization. Via email, our staff will answer your questions in several areas of the faith.
http://www.askacatholic.com
Coming Home Network: Resources for all Christians who are inquiring into the Catholic Church including contacts and fellowship, guidance and support for pastors and clergy, and clear teaching of the Catholic Faith.
http://www.chnetwork.org/
Comparing Mormonism to the Bible: Compares Mormonism to the Bible using the teachings of the Catholic Church to interpret the Bible.
http://www.comparing-views.com/
Defenders of the Faith, Inc.: An organization of lay persons using their resources to educate Roman Catholics in the orthodox practice of their faith through the publication of "The Defender" published free 10 times per year.
http://www.TheDefender.org/
Envoy Magazine: An exciting journal that presents the truths of the Catholic faith in a fresh, contemporary style. Edited by Patrick Madrid.
http://www.envoymagazine.com/
Hands On Apologetics: Thy Faith, Inc. is a lay-run Catholic apologetics ministry dedicated to providing practical tools to help Catholics learn how to share and defend their Faith.
http://www.handsonapologetics.com
Magnificat Institute Press: Dedicated to publishing the finest books in apologetics, catechetics, evangelization, and spirituality on the market--both out of print books to be reprinted, and new books by new and established authors. Magnificat provides free gift copies to parishes, groups, events or other forums.
http://www.magnificatpress.com/
Order of the Legion of St. Michael: Catholic SuperSite loyal to the Pope offering information and services: including real audio, web radio, Q & A Forums, support groups, mail lists, chatrooms, information, libraries, and more.
http://www.saint-mike.org/
Our Catholic Faith: Learn about the Catholic Faith. Experience the complete expression of the Christian Faith. Come and join us in our 2000 year old Christian Tradition.
http://www.ourcatholicfaith.org/
Peter Kreeft: Peter Kreeft, Ph.D., is a professor of philosophy at Boston College. As an author of over 40 books and a regular contributor to several Christian publications, he is in wide demand as a speaker at conferences.
http://www.peterkreeft.com
San Juan Catholic Seminars: Features booklets by Father Frank Chacon and Jim Burnham along with tapes by the authors and an invaluable Catholic Concordance. Readers will discover how easy it is to show the biblical basis for the most commonly misunderstood Catholic beliefs with charity.
http://www.catholicapologetics.com/
Scripture Catholic: Scripture Catholic is an internet apostolate devoted to teaching about the Scriptural basis for the Catholic faith. The web page provides over 2,000 Scripture citations that explain and defend the teachings of the Church.
http://www.scripturecatholic.com/
Still Catholic: A mix of quizzes, apologetics, essays, Church Fathers, morality, social teaching, and links to a wide array of documents.
http://www.stillcatholic.com/
Totus Tuus Ministries: The purpose of this ministry is to evangelize Catholics through retreats, conferences, the study of Sacred Scripture and defense of the Catholic Faith.
http://www.totustuus.com/