CCEL Translations: Early Church Fathers in English
Everything from the Apostolic Fathers through Gregory the Great II.
Translations of Tertullian’s works.
Tertullian.org: Church Fathers
Translations of the Church Fathers (in English).
Migne’s Patrologia Latina
Scans of the complete PL series of Migne. Many Patristic Latin works remain published in Migne’s series alone. Links are various: some to archive.org, others to google books.
Commentaries on Genesis
A list of early Christian writers who have written (partially) extant commentaries on Genesis creation narratives, with links to where you can find them.
Resources from the Syriac Computing Institute.
ASSOCIATIONS & PROJECTS
North American Patristics Society
Commission for Editing the Corpus of the Latin Church Fathers
Journal of Early Christian Studies
International Journal for the Study of the Christian Church
Journal of Ecclesiastical History