Philosopher's Index (1940+): Citations of journal articles, monographs, encyclopedias, anthologies, and book reviews from all areas of Philosophy as well as related fields; and philosophy of various disciplines, such as Education, History, Law, Religion, and Science.
PhilPapers: Philosophical Research Online: A comprehensive, multilingual database, covering journals, books, open access archives, and personal pages maintained by scholars. The content is arranged by topics in a structured bibliography that covers all subjects related to Philosophy and different philosophical traditions, as well as philosophy of specific disciplines (Biology, Mathematics, Social Science, Religious Studies, Language, etc.). Get a free, personal account for research updates.
ATLA Religion Database + ATLAS (1949+): American Theological Association Database covers mainly Religious Studies fields, but also philosophy and ethics. Includes citations and full-text of journals articles, magazine essays, and book reviews.
Project Muse - Premium Collection: Provides worldwide, networked, subscription access to the full text of the Johns Hopkins University Press scholarly journals in the humanities, social sciences, and mathematics.(1990+)