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.
Believer's Web: Biographies: 100+ biographical articles.
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.
Christian History: Includes recent articles from Christianity Today magazine.
Christian History Institute: Features daily articles, quotations, chronologies, and reviews.
Church History and Historical Theology: Annotated directory. Patristics, New Testament era to 1200, 1200-1600, links.
Church History Timeline Index: A timeline of Church history, with emphasis on the first several centuries.
ChurchRodent: Glossary of Christian History: By R. A. Tatum, partly based on Bruce Shelley's "Christian History in Plain Language."
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.
History of Christianity in China: A small encyclopedia, including information on Chinese culture.
James Kiefer's Hagiographies: Brief biographical notes, arranged by (Anglican) liturgical calendar.
Overview of Late Antiquity: Includes several articles on Christianity in the 4th-7th centuries; many articles on the historical and religious background.
Story of the Church: Overview of church history through the reformation: notes from classes taught at Community Bible Chapel, Richardson, Texas.
Territorial Evolution of Christianity: Historical review, with statistics and maps.
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.
The Tredways: Church History Timelines: Major events shown in two timelines: ancient and medieval, reformation and modern.
The Wesleys (John, Charles, Susanna) and Their Times: Loads of material, primary and secondary sources.
Wesley Center for Applied Theology: Archive of Wesleyan and Holiness texts; sales of "Wesleyan Heritage" CD-ROM.
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.