Stanford Encyclopedia of Philosophy, Gottlob Frege. Entry has a biography, chronology, and analysis of Frege's works, chronology of works, bibliography of secondary literature, and links to other sites.

Stanford's Metaphysics Research Lab web site has a chronology, list of principle works, and reading list for Frege.

MacTutor site at St. Andrews contains a brief biography and links to a list of references, quotations, images, and links to related sites.