Histories of ancient Christianity
Chadwick, Henry. The Early Church. (The most straightforward single-volume history of ancient Christianity)
Kelly, J. N. D. Early Christian Doctrines.
Introductions to the fathers
Hall, Christopher A. Living Wisely with the Church Fathers.
Hall, Christopher A. Worshipping with the Church Fathers.
Hall, Christopher A. Reading Scripture with the Church Fathers.
Hall, Christopher A. Learning Theology with the Church Fathers.
Ramsey, Boniface. Beginning to Read the Fathers.
Wilken, Robert Louis. The Spirit of Early Christian Thought.
Lives of the fathers
Di Berardino, Angelo, Thomas C. Oden, and Joel C. Elowsky. Encyclopedia of Ancient Christianity. (3 very large vols)
Di Berardino, Angelo. Patrology: The Eastern Fathers from the Council of Chalcedon (451) to John of Damascus (750). (Operates as a fifth volume of Quasten, below)
Drobner, Hubertus R. The Fathers of the Church: A Comprehensive Introduction.
Quasten, Johannes. Patrology. 4 vols.
Other series of the fathers
The Fathers of the Church: A New Translation, 125+ vols. (Catholic University of America Press, 1947–present)
Ancient Christian Writers (Newman Press)
Popular Patristics Series (St. Vladimir’s Seminary Press)
Loeb Classical Library (includes only a limited selection of Christian texts; this selection will no longer be expanded)
Less important for this reading plan but good to know when expanding your reading:
Dumbarton Oaks Medieval Library (includes some fathers at early end of spectrum)
Writings from the Greco-Roman World (Society for Biblical Literature — not exclusively the fathers)
Translated Texts for Historians (Liverpool University Press — late antique texts from c. 200-800, including some fathers)
Works by the fathers not included in ANF or NPNF
Pearse, Robert, ed. Early church fathers: additional texts
MJH (the admin of Read the Fathers, Matthew). Church Fathers Online — includes links to ANF, NPNF, Pearse, and other texts they miss.