- Association of Religion Data Archives: The Association of Religion Data Archives (ARDA) is a project funded by the Lilly Endowment Fund and acts to preserve quantitative data on American religion, to improve access to this data, to increase the use of the data, and to allow comparisons across data files. The ARDA collection includes data on churches and church membership, religious professionals, and religious groups (individuals, congregations and denominations). The site's most popular features are interactive maps and reports, surveys (and the ability to create surveys), and learning modules.
- Database of Religious History: This freely available database consolidates religious history research from numerous scholars in one place. There are topic overviews for hundreds of subjects, with citations for further research.
- Encyclopedia Mythica : An encyclopedia of mythology, folklore and religion.
- Pew Research Center - Religion: Opinion polling, demographic data and trend research on religions.
- Pluralism Project - Harvard University: This project at Harvard University aims to "[study] and [interpet] the changing religious landscape of the United States." The site contains primers on various religious, case studies, and mapping of religions in various locations.
- Women in Judaism : A multidisciplinary free, full-text, refereed e-journal, available exclusively on the web, which offers contemporary writings, journal articles, and an encyclopedia of Jewish women.
- Worldwide Faith News : Worldwide Faith News is a data base of full text official news releases and other documents, including policy statements, from the news offices of national and world faith groups. This collection indexes more than 18,000 documents, including posts in French, Spanish, and German.