How delightful to come across a website that allows one to download books for free. Vern S. Poythress, Professor of New Testament Interpretation at Westminster Theological Seminary, has made a number of his books available on line, specifically: The Gender-Neutral Bible Controversy; God Centered Biblical Interpretation; The Returning King: A Guide to the Book of Revelation; Redeeming Science: A God-Centered Approach; and Symphonic Theology. The Amazon.com listing of Poythress's books can be found here.
I do not write as a "fan" of Poythress necessarily (I haven't read that much of his work), but as one who recognizes the importance of serious theology and who appreciates having access to Poythress' perspective.