The Routledge Encyclopedia of Philosophy Online (REP online) is a comprehensive and regularly updated resource with over 2,700 new and revised articles. Clearly organised, it has over 25,000 cross-references linking themes, concepts and philosophers. It serves as a reference source in philosophy as well as politics, psychology, economics, anthropology, religion, and literature.
Tip: if you register for personalised access you can save articles and sections to read later, create and label shortlists, and receive notification of new articles in your field.