Sacred Scripture

• Catena Aurea (St. Thomas Aquinas’ synthesis of patristic commentaries on the Gospels)
• More patristic commentaries

Dogma

• Denzinger
• Theological Notes (an interesting chart on doctrinal statements – even if somewhat rigorist)

St. Thomas Aquinas

• Summa Theologica (New Advent)
• Major works (English)
• Opera Omnia (Latin)
• Aquinas 101 (video series)
• 24 Thomistic Theses

Catechisms

• Roman Catechism (Trent)
• Baltimore Catechism
• Catechism of the Catholic Church (universal)

Moral Theology (NB: you may need to search the author in Google Books to find the other volumes)

• St. Alphonsus Liguori
• McHugh and Callan (English)
• Prummer (one-volume synthesis, English)
• Busembaum
• Bonacina
• Salmanticenses
• De Lugo
• Sanchez (De Matrimonio)
• Laymann
• Sporer
• Lessius (De Iustitia et Iure)
• Grisez (tabs at the top, English)
• Filliuci
• Martin Azpilcueta (Navarrus) (Spanish)
• Azor
• Jone
• De Soto
• Molina (De Iustitia et Iure)
• Grotius (The Rights of War and Peace) (English)
• Anthony of the Holy Spirit
• Diana
• Bossuet (French)
• Tamburinus
• Merkelbach, vol. I, & vol. II
• Gury
• Slater (English)
• Frederick of Jesus
• Henriquez
• Von Kaysersberg
• Sasserath
• Lehmkuhl (Theologia Moralis: Theologiam Moralem Generalem)
• Henno
• Terill (Fundamentum), and Regula
• Concina

Social Doctrine

• Christian Social Teaching (Höffner) (English)
• Principles of Political Economy (Liberatore) (English)

Spirituality

• Spiritual Theology (Jordan Aumann)
• Garrigou-Lagrange (English texts – does not include “Three Ages”)
• More Dominican texts

Miscellaneous

• Church Fathers, Catholic Encyclopedia, news, and more (New Advent)
• Praxis Confessarii (St. Alphonsus Liguori’s confessional manual)
• Gratian (Decretals, etc.)
• More Gratian (From the Quinque Libri, specifically concerning marriage law)
• Acta of Vatican II
• Documenta Catholica Omnia (Patrologia Graeca and Latina, Councils, Papal texts, etc.)
• Acta Apostolicae Sedis; Acta Sanctae Sedis
• Miscellaneous Vatican World War II texts
• JustFacts (general research)