"The Association of Religion Data Archives (ARDA) strives to democratize access to the best data on religion. Founded as the American Religion Data Archive in 1997 and going online in 1998, the initial archive was targeted at researchers interested in American religion. The targeted audience and the data collection have both greatly expanded since 1998, now including American and international collections and developing features for educators, journalists, religious congregations, and researchers. Data included in the ARDA are submitted by the foremost religion scholars and research centers in the world." -from the ARDA About page
The Cooperative Digital Resources Initiative of the American Theological Library Association and Association of Theological Schools is a repository of digital resources contributed by member libraries… The CDRI database provides access to digital images of woodcuts, photographs, slides, papyri, coins, maps, postcards, manuscripts, lithographs, sermons, shape-note tune books, and various forms of Christian art, architecture, and iconography.
A large Library of Christian primary sources online. Titles may be viewed online in plain text or purchased in PDF format. Includes a complete set of the Church Fathers, the Institutes of Christian Religion by Calvin, Calvin’s Commentaries, etc.
The mission of the Open Access Digital Theological Library (OADTL) is to make all open access content in religious studies and related fields discoverable to everyone, everywhere in the world through a single search experience for free forever. The OADTL currently contains about 100,000 OA ebooks and several hundred thousand articles in religious studies.
A collection of writings from Early Church Fathers not included in the Christian Classics Ethereal Library.
An annotated list of open-access journals, websites, and other online scholarly resources on religion and theology.
Free and open databases on theological and related topics.
The digital repository for the Presbyterian Historical Society, featuring searchable collections of photographs, correspondence, sound and video recordings, objects, and manuscript material from their holdings.
Full-text digitized versions of public domain works. Includes valuable collections in Theology Reference and Methodism.
A collection of links pointing to statistical data on denominations, congregations, faith, and other religions topics.
A collection of resources relating to the development of theology during the Post-Reformation / Early Modern era (ca. 16th-18th c.), hosted by the H. Henry Meeter Center for Calvin Studies of Calvin College and Calvin Theological Seminary.
This web site, in existence since 1995, focuses on free (open-access) internet resources (bibliographies/indexes, library and archive catalogs, dictionaries/encyclopedias, e-texts and journals) supporting the academic study of religion. In any list as sizeable as this one, a few broken links are almost inevitable, but there's a lot of helpful material here. This page forms part of a more general gateway to religious studies resources.
The Theological Commons is a digital library of 79,331 books and periodicals on theology and religion, including 29,730 volumes from the Princeton Theological Seminary Library.
This is a customized Google search designed by Sally Jo Shelton that serves as a supplement to other theological search engines (ATLA, Religion Online). It searches 723 sites including some free access sites.
An extensive annotated guide to electronic resources related to the study, practice and teaching of religion; organized by topic.
Theological - Historical
This is a full-text searchable version of a large collection of printed works (including books, pamphlets, broadsides) in England and its colonies and any item that was printed anywhere in the world in English between 1473 and 1700. Includes important material documenting church history and the Protestant Reformation.
Primary documents related to Gnosticism. Includes a translation of the Dead Sea Scrolls.
This site provides a mine of useful information for those interested in historical theology. The medieval, Islamic, Jewish, and Indian sourcebooks may be of particular interest to those working in these areas. Unfortunately, some links to external resources are broken.
A searchable database of Medieval and Renaissance manuscripts from the HRC collection. Includes complete digital images of some manuscripts, and more digitized images will be added in the future.
Texts by and about Martin Luther.
Includes links to artwork indexed by Bible theme and movie concordance related to scripture.