We have a Scotus thread. We have an Ockham thread. It's about time we shamelessly crowdsource a proper St. Thomas and Thomism thread:

Peter Coffey

• The Science of Logic: An Inquiry into the Principles of Accurate Thought and Scientific Method (I, II) 
• Ontology, or, the Theory of Being: An Introduction to General Metaphysics  (online)
• Epistemology, or, the Theory of Knowledge: An Introduction to General Metaphysics (I, II)

A. C. Cotter

• ABC of Scholastic Philosophy ([url=https://babel.hathitrust.org/cgi/pt?id=uc1.$b143684;view=1up;seq=7]online[/url])

Frederick Coplestone

• A History of Philosophy
• Aquinas

Brian Davies

• An Introduction to the Philosophy of Religion
• The Reality of God and the Problem of Evil

Edward Feser

• Aquinas
• Neo-Scholastic Essays
• Scholastic Metaphysics
• Edward Feser's Blog

Reginald Garrigou-Lagrange

• Christ the Saviour: A Commentary on the Third Part of St. Thomas's Theological Summa (online)
• Grace: Commentary on the Summa Theologica of St. Thomas, Ia Iiae, q. 109 – 114. (online)
• Life Everlasting (online)
• Providence (online)
• Reality: A Thomistic Synthesis (online)
• The Trinity and God the Creator: A Commentary on St. Thomas's Theological Summa, la. q. 27 – 119 (online)

Etienne Gilson

• Being and Some Philosophers
• The Unity of Philosophical Experience

John Haldane

• Faithful Reason: Essays Catholic and Philosophical

George Hayward Joyce

• Principles of Natural Theology (online)

Ralph McInerny

• Metaphysics
• Epistemology
• Philosophy of Nature
• Philosophical Pyschology
• Natural Theology
• A Course in Thomistic Ethics

George F. McLean (ed.)

• An Annotated Bibliography of Philosophy in Catholic Thought 1900–1964

Barry Miller

• From Existence to God
• A Most Unlikely God
• The Fullness of Being
• Analysis of Existing (by Elmar Kremer)

David S. Oderberg

• Real Essentialism

Eleonore Stump

• Aquinas

William Wallace

• The Elements of Philosophy: A Compendium for Philosophers and Theologians
• The Modeling of Nature: Philosophy of Science and Philosophy of Nature

Bernard Wuellner

• Dictionary of Scholastic Philosophy
• Summary of Scholastic Principles

Online

• Scholastic's Bookshelf (I, II, III, IV)
• Aquinas Online
• New Advent
• Just Thomism

Primary Source

• Dominican House of Studies Priory of the Immaculate Conception: St. Thomas Aquinas's Works

I have absorbed most of the resources from the original Aquinas thread into this one.