Patrologiae Cursus Completus. Series Latina by
This set, abbreviated as PL in most scholarly texts, is primary sources from the Church Fathers in Latin. However, it is dated. But it preserves some texts that are found no where else.
Patrologiae cursus completus. Series Graeca by
This set, abbreviated as PG in most scholarly texts, is primary sources from the Church Fathers in Greek. However, it is dated. But it preserves some texts that are found no were else.
Corpus Christianorum. Series Latina (CCSL)
A more up to date set of primary sources from the Latin Church Fathers.
Sources chrétiennes
This is one of the quintessential international sets of primary material on the Church Fathers. It covers Greek, Latin, and other language texts and provides both a critical edition of the original text with a translation into French.
For a complete series listing, see http://sources-chretiennes.editionsducerf.fr/
Papyrologische Texte und Abhandlungen
This is a series that contains some works of the early Church Fathers. It provides a critical Greek text along with a translation into German.
St. Irenaeus of Lyons Against the Heresies by Proof of the Apostolic Preaching by The Song of Songs: Commentary and Homilies by Commentary on the Gospel according to John : Books I, II, IV, V, VI, X by Commentary on the Gospel According to John : Books 13-32 by Origen on First Principles : Being Koetschau's Text of the De principiis. by
While the scholarship of this work is primitive and biased, it is the best available translation of the various editions of Origen's "De principiis."
The Incarnation of the Word of God : Being the Treatise of St. Athanasius, De incarnatione Verbi Dei by The Life of Antony and the Letter to Marcellinus by The City of God Against the Pagans. by Confessions by Select Orations by The Book of Pastoral Rule by Morals on the Book of Job by 
The Ante-Nicene Fathers : Translations of the Writings of the Fathers Down to A.D. 325 by
This is a good set when it comes to the overall sampling of Ante-Nicene texts, but the English translation is dated, being from the late 19th century through the early 20th century.
Nicene and post-Nicene fathers. First series by
This is a good set when it comes to the overall sampling of the Nicene-post Nicene texts, but the English translation is dated, being from the late 19th century through the early 20th century.
This first series contains the works of St. Augustine and St. John Chrysostom.
Nicene and post-Nicene Fathers. Second series by
This is a good set when it comes to the overall sampling of Nicene-post Nicene texts, but the English translation is dated, being from the late 19th century through the early 20th century.
"Fathers of the church" by
This is a more modern English translation of various Greek and Latin Church Fathers. It is considered a high quality scholastic series of works from the Catholic University of America Press.
Ancient Christian Writers
This is another modern English translation of various Greek and Latin Church Fathers.
The Works of Saint Augustine : A Translation for the 21st Century by
This is a modern English Translation of the works of St. Augustine.