Primary texts of the early Christian church

• The Early Church Fathers (Ante-Nicene; Nicene; Post-Nicene Fathers)
• Early Church Fathers – Additional Texts
• The Fathers of the Church (New Advent)
• Early Christian Writings
• The Early Church Documents
• Gnostic Texts
• Apocryphal Acts
• Non-canonical Literature
• Latin Classical & Patristic Texts
• The Latin Library – Latin Texts
• Biblioteca Augustana: Latin Texts
• The Tertullian Project
• Online Medieval & Classical Library
• Medieval Sourcebook
• Corpus Thomisticum

From a list at the website of Jim Papandrea