Ad Hoc - - Resources for teaching and research relating to the history of Christianity, compiled by Yale University.
Ancient History Sourcebook: Christian Origins - - Takes a look through the history of the Church from the first century to present-day as well as links to other faiths such as Islamic and Jewish.
Christian Biography Resources - - A directory of links to sources on British and American authors, preachers, hymn writers and missionaries, together with links to collections of Christian biographies.
The Christian Catacombs of Rome - - History and description of the underground cemeteries used from the 2nd to the 5th centuries. Includes a section on the symbols used, but no images.
Christian History - - Includes recent articles from Christianity Today magazine.
Cross Search Church History - - Links: to churches, archives, glossaries, specific theologies, and general history.
Dictionary of Christian Biography and Literature - - A Dictionary of Christian Biography and Literature to the End of the Sixth Century A.D., with an Account of the Principal Sects and Heresies. By Henry Wace.
Divinity Library, Vanderbilt University - - Collections and publications, databases, online periodicals in religion/theology, directory of online resources.
Ecole Initiative - - Hypertext encyclopedia of early Christian Church history.
Overview of Late Antiquity - - Includes several articles on Christianity in the 4th-7th centuries; many articles on the historical and religious background.
Sketches of Church History - - The history of the Christian Church from the Apostolic Age through the Inquisition, in 29 short chapters.
Story of the Church - - Overview of church history through the reformation: notes from classes taught at Community Bible Chapel, Richardson, Texas.
Worlds of Late Antiquity - - Materials relating to the culture of the Mediterranean world in late antiquity (roughly 200-700 C.E.); by James O'Donnell at Georgetown University.