Cambridge Companions Online offers subject or theme based collections in a searchable online environment. The Companions are available as a Complete Collection; Cambridge Companions in Literature and Classics; the Cambridge Companions in Philosophy, Religion and Culture; and the Companions in Music.
JSTOR is database that contains scholarly articles from many disciplines and subject areas. Much of its content is available in full-text (although full-text of recent articles may not be available for a year or more).
PhilPapers is a comprehensive index of philosophy books and articles. PhilPapers offers unique features such as real-time indexing of pre-prints, fine-grained classification by topic, email alerts, reading lists, advanced search functionality, and discussion forums.
International coverage of journal articles, selected web sites, and patents in the sciences, social sciences, and humanities; provides citation tracking for 1996+ (select coverage for earlier periods) and cited reference searches back to 1970.