Christianity: Early Centuries
- Apostolic Constitutions
- Athanasius: On the Incarnation
- Augustine
- Apocrypha and Early Christian Lit.
- Christian Classics Ethereal Library
- Christian Lit on Internet (Iclnet)
- Early Church Fathers
- Early Church Documents (circa 96-150 A.D.)
- Early Church Documents (Iclnet)
- Ecole Initiative: Early Church Documents
- Ecumenical Councils: Documents
- The Gnosis Archive
- Gnostic Library
- Jerusalem in Early Christian Times
- Mandaean Materials
- Manichaean Materials
- Martyrdom
- Medieval Sourcebook
- Noncanonical Homepage
- Old English "Bible"
- Origen: Against Celsus
- Origen on Classical Learning
- Origen: Contra Celsum (large file)
- Tertullian: To the Martyrs
- Tertullian: De Corona Militis
- Tertullian: Against Marcion
- Tertullian, Origen, Cyprian: Lord's Supper
- Tertullian: Bio
- Tertullian: Against Marcion (best)
- Tertullian: Apology
- Tertullian: On Idolatry