Story of the Church
Overview of church history through the reformation: notes from classes taught at Community Bible Chapel, Richardson, Texas.
http://www.ritchies.net/churchhi.htm

Wesley Center for Applied Theology
Archive of Wesleyan and Holiness texts; sales of "Wesleyan Heritage" CD-ROM.
http://wesley.nnu.edu/

The Wesleys (John, Charles, Susanna) and Their Times
Loads of material, primary and secondary sources.
http://gbgm-umc.org/umhistory/wesley/

Cross Search Church History
Links: to churches, archives, glossaries, specific theologies, and general history.
http://www.crosssearch.com/Science_and_Social_Science/History/Church_History/

Ad Hoc
Resources for teaching and research relating to the history of Christianity, compiled by Yale University.
http://www.yale.edu/adhoc/

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.
http://www.wholesomewords.org/biography/bio.html

Ecole Initiative
Hypertext encyclopedia of early Christian Church history.
http://www2.evansville.edu/ecoleweb/

Overview of Late Antiquity
Includes several articles on Christianity in the 4th-7th centuries; many articles on the historical and religious background.
http://www.nipissingu.ca/department/history/muhlberger/orb/OVINDEX.htm

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.
http://www.catacombe.roma.it/

History of Christianity in China
A small encyclopedia, including information on Chinese culture.
http://www.yutopian.com/religion

James Kiefer's Hagiographies
Brief biographical notes, arranged by (Anglican) liturgical calendar.
http://elvis.rowan.edu/~kilroy/JEK/

ChurchRodent: Glossary of Christian History
By R. A. Tatum, partly based on Bruce Shelley's "Christian History in Plain Language."
http://tatumweb.com/churchrodent/

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.
http://www.fordham.edu/halsall/ancient/asbook11.html

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.
http://www.georgetown.edu/faculty/jod/wola.html

Church History Timeline Index
A timeline of Church history, with emphasis on the first several centuries.
http://www.geocities.com/Heartland/Pines/7224/Rick/chronindex.htm

Church History and Historical Theology
Annotated directory. Patristics, New Testament era to 1200, 1200-1600, links.
http://www.users.csbsju.edu/~eknuth/itr/chht/index.html

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.
http://www.ccel.org/ccel/wace/biodict.html

Believer's Web: Biographies
100+ biographical articles.
http://www.believersweb.org/showdocs.cfm?cat=6

Christian History Institute
Features daily articles, quotations, chronologies, and reviews.
http://chi.gospelcom.net/

Divinity Library, Vanderbilt University
Collections and publications, databases, online periodicals in religion/theology, directory of online resources.
http://divinity.library.vanderbilt.edu/

The Tredways: Church History Timelines
Major events shown in two timelines: ancient and medieval, reformation and modern.
http://www.tredways.org/church_history/

Territorial Evolution of Christianity
Historical review, with statistics and maps.
http://www.religionstatistics.net/histen.htm