J. J. O'Donnell's Augustine Site at the University of Pennsylvania (http://ccat.sas.upenn.edu/jod/augustine.html)
Christian Classics Ethereal Library: An article, some links, and the text of The Confessions of St. Augustine, City of God, On Christian Doctrine, and Handbook on Faith, Hope, and Love (http://www.ccel.org/a/augustine/augustine.html)
Nicene and Post-Nicene Fathers: Seven volumes of Augustine's writings (http://www.ccel.org/fathers2/)
Christian Classics Ethereal Library: text of Proslogion, Monologion, Cur Deus Homo, and Meditations and Prayers (http://www.ccel.org/a/anselm/).
Jasper Hopkins' translations of Anselm (http://cla.umn.edu/sites/jhopkins/).
Christian Classics Ethereal Library: An article, some links, and the text of Summa Theologica, Summa Contra Gentiles -- selections, tr. Joseph Rickaby, Catena Aurea (Patristic Commentary on the Gospels), and The Catechetical Instructions of St. Thomas Aquinas (http://www.ccel.org/a/aquinas/aquinas.html)
Alfred Freddoso's translation and commentary of the Summa Theologica (http://www.nd.edu/~afreddos/).
Thérèse Bonin's Bibliography of Thomas Aquinas in English, with many links to online editions (http://www.home.duq.edu/~bonin/thomasbibliography.html).
The Aquinas Translation Project (http://www4.desales.edu/~philtheo/loughlin/ATP/index.html)
Christian Classics Ethereal Library (http://www.ccel.org/)