- ATLA Religion Database - A major index of journal articles, book reviews, and essay collections in theology and religious studies with full-text of more than 80 journals.
- Base d'Information Bibliographique en Patristique (BIBP) - A French-Canadian bibliographic database of periodical literature on the Church Fathers.
- Bibliographies for the Study of Early Christianity & Patristic Theology - Complied by William Harmless, S.J.
- Ecole Initiative - A project to create a hypertext encyclopedia of early church history.
- Corpus Scriptorum Ecclesiasticorum Latinorum (CESL) - A complete list of volumes arranged according to author.
Texts and Images
- Early Church Fathers in English Translation - Online versions of the translations from the Ante-Nicene Fathers and the Nicene and Post-Nicene Fathers.
- Guide to Early Church Documents - From the Internet Christian Library, a guide to on-line early Christian texts, mostly in English translation.
- Patrologia Graeca - Mischa Hooker's index to the digitized volumes in Google Books.
- Patrologia Latina - A digital version of Migne's collection of the writings of the Latin Church fathers.
- Searchable Latin Vulgate Bible - Part of the ARTFL project hosted by the University of Chicago.
- Vetus Latina - A database of pre-Vulgate Latin versions of the Bible.