Alvin Plantinga is perhaps the greatest Christian philosopher alive today (he's my favorite current philosopher), and certainly among the best in philosophy of religion: specifically religious epistemology (sort of a half-sister of apologetics in a sense). Here are all or mostly all of his books available online, for free:
God and Other Minds: A Study of the Rational Justification of Belief in God (1967) [see amazon page]
God, Freedom, and Evil (1973) [see amazon page]
The Nature of Necessity (1974) [see amazon page]
Does God Have a Nature? (1980) [see amazon page]
Warrant and Proper Function (1993) [see amazon page]
Warrant: The Current Debate (1993) [see amazon page]
The Analytic Theist: An Alvin Plantinga Reader (edited by James F. Sennett, 1998) [see amazon page]
Warranted Christian Belief (2000) [see amazon page]
Essays in the Metaphysics of Modality (2003; edited by Matthew Davidson) [see amazon page]
Knowledge of God (with Michael Tooley, 2008) [see amazon page]
Science and Religion: Are They Compatible? (with Daniel C. Dennett, 2010) [see amazon page]
Where the Conflict Really Lies: Science, Religion, and Naturalism (Nov. 2011) [see amazon page]
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