In my view the strongest (in terms of being helpful to Catholic theology – even though most Catholic theologians today are caught up in Continental thought – and standing on its own) contemporary Catholic philosophical movement is Analytic Thomism, which has thus far consisted of two stages, the ‘old dogs’ and the ‘new blood’ respectively: (a) the foundational work of ‘Aquinatic Wittgensteinians’ such as G.E.M. Anscombe, Peter Geach, Anthony Kenny, and Philippa Foot; and (b) the current work of philosophers like John Haldane, Brian Davies, Alasdair MacIntyre, Eleonore Stump, Norman Kretzmann, John Finnis, Joseph Boyle, Brian Shanley, and Herbert McCabe. The latter stand out in the philosophy of religion particularly, but have also done very interesting work in metaphysics, Ethics, and political philosophy. Overall, this is Thomism extracted from the ‘cobwebs’ of the Scholastic manuals and the ‘traditional Thomism’ of commentators like Reginald Garrigou-Lagrange and brought into communion with the Analytic tradition, way of thought and expression. Important to note, however, is that it is rarely slavish in the sense that previous forms of Thomism have been: Analytic Thomists generally do not look to St. Thomas as their ‘master’ like a Jacques Maritain did. Rather, they are basically independent Analytic philosophers who see in the texts of Aquinas valuable philosophical thought which deserves to be communicated to the post-modern world but who are not adverse to straying from his conclusions when it seems to be the case that he was wrong. They are influenced and inspired by St. Thomas, but are not constricted by his system (naturally, since Aquinas was not an Analytic philosopher).
There is also a kind of third form of this movement which has popped up in recent years, which is a group of more or less secular scholars of philosophy in the Analytic tradition, who cannot really be called ‘Thomists,’ but, for one reason for another (I suspect that job security is a contributing factor, for scholars of Aquinas and medieval philosophy generally are in short order in universities today), have taken an interest in some aspect of Aquinas’ work and have produced valuable translations and commentaries of St. Thomas. Robert Pasnau at Colorado University (Boulder) and two professors of mine at the University of Toronto, Martin Pickave and Peter King, are good examples.