On-line Texts and Source Collections:

ARTFL Bible Project: on-line version of several translations of the bible (including King James, the Vulgate, Luther, and others).

Fathers of the Church: texts from the Fathers of the Church series (including writings by St. Augustine, St. Ambrose, St. Athanasius, St. Leo, St. Gregory, and others).

Internet Medieval Source Book: an extensive collection of primary sources for studying the ancient, medieval and Reformation periods (including writings by Augustine, Anselm, Aquinas, Luther and many others).

MIT Classics Project: database of ancient Greek and Latin texts.

Perseus Project: Classical Greek and Roman Resources, including texts, textual aids, and images.

Thomas Aquinas: on-line versions of several of St. Thomas's Summa Theologiae, Summa Contra Gentiles, and On Being and Essence.
 
 

Related Websites:

American Academy of Religion
Society of Biblical Literature
American Philosophical Association
Luther House of Study