BYU Digital Collections
Huge selection of primary sources in journals, master's theses, historical photographs, 19th century Mormon publications, etc.
A crucial source for those interested in the LDS academic experience or Mormon studies in general. The site has many free articles, etc. in .pdf form.
Dialogue: A Journal of Mormon Thought
An independent national quarterly established to explore Mormon culture (1966-present).
Element: A Journal of Mormon Philosophy and Theology
Publication of the Society for Mormon Philosophy and Theology.
Encyclopedia of Mormonism
An excellent and under-used resource, first published in 1992.
The Foundation for Apologetic Information and Research is a volunteer organization focused on providing answers to questions regarding the LDS Church.
Journal of Discourses
HTML version. See also the original scans in .pdf.
Journal of Mormon History
Scholarly research and publication in the field of Mormon history (1975-present).
The official website of the Church of Jesus Christ of Latter-day Saints.
LDS General Conference Reports
A collection of conference reports from 1880 to the present.
Up-to-date press releases, stories, and commentary from LDS Public Affairs.
Mormon Historical Studies
An independent periodical including essays, biographies, documents, book reviews, historical site descriptions, indexes, and archival listings published by the Mormon Historic Sites Foundation.
Neal A. Maxwell Institute For Religious Scholarship
Formerly called FARMS, publications from the Institute include the Journal of Book of Mormon Studies, the FARMS Review, and other FARMS books all of which can be read online for free.
A great resource on world religion, including a portal specifically dedicated to Mormon studies.
Signature Books Online Library
This site has a bunch of Signature titles including Lucy's Book, the Heber C. Kimball diaries, essays by Eugene England and Richard D. Poll, and other interesting books.
"Mormon experience, scholarship, Issues, and Art" (1975-present).
The "B.H. Roberts Disclaimer"
"All the works given [here] should be read with discrimination; not accepting either all the premises laid down, or the conclusions reached. They are given merely as sources through which the student may pursue his [or her] thought-investigations, not for unquestioning acceptance" (B. H. Roberts, The Truth, the Way, the Life: An Elementary Treatise on Theology, ed. John W. Welch [Provo, Utah: BYU Studies, 1994], 36-37).