Christian Classics Ethereal Library
Early Christian Writings
Gnosis Archive: Resources on Gnosticism and Gnostic Tradition
Internet Medieval Sourcebook: Full Text Resources
Perseus Digital Library: Sources for the Study of Ancient Greece and Rome
Tertullian Project
Wesley Center Online: Non-Canonical Literature
Biblindex: Index of Biblical Quotations and Allusions in Early Christian Literature
Bibliothèque de l'Université Laval: Bibliographic Information Base in Patristics
Dumbarton Oaks Hagiography Database
Index theologicus: Zeitschrifteninhaltsdienst Theologie der Universitätsbibliothek Tübingen
Byzantium: Byzantine Studies on the Internet
Gospel of Thomas Homepage
NetSERF: The Internet Connection for Medieval Resources
New Advent: Catholic Encyclopedia, Summa Theologica, Church Fathers
New Testament Gateway
Resource Pages for Biblical Studies
St. Pachomius Library: A Living Encyclopaedia of Orthodox Christianity