A Slice of Philosophy: Gottlob Frege (1848-1925)
- Features a biography of the mathematician's life and a bibliography of his works, as well as suggestions to secondary literature.
- http://www.findlink.dk/frege/frege.htm

Philosophy Professor
- About the life and studies of Gottlob Frege.
- http://www.philosophyprofessor.com/philosophers/gottlob-frege.php

On Sense and Reference
- English translation of Gottlob Frege's 1892 "Über Sinn und Bedeutung," by Max Black.
- http://wikisource.org/wiki/On_Sense_and_Reference

Gottlob Frege
- Biography from Wikipedia.
- http://en.wikipedia.org/wiki/Frege

Frege: Two Theses, Two Senses
- Article by Carlo Penco discusses a vacillation by Frege in his account of the relation between thoughts and sentences. Penco discusses the attempts to resolve this uncertainty by Currie, Dummett and others before advancing his own account.
- http://www.dif.unige.it/epi/hp/penco/pub/2th.htm

Frege
- Interpretative essay on Frege's philosophy by Rainer Born.
- http://sowi.iwp.uni-linz.ac.at/Dialog/fregerib/frege0.html

Frege's Logic, Theorem, and Foundations for Arithmetic
- Stanford Encyclopedia article on Frege's work on the foundations of mathematics.
- http://plato.stanford.edu/entries/frege-logic/