- Frege's Theorem - Article in the Stanford Encylcopaedia of Philosophy, entitled `Frege's Logic, Theorem, and Foundations for Arithmetic'. Discusses the 1980 discovery of Crispin Wright that Frege's work of the Grundgesetze can be carried out in second-order logic with Hume's principle.
- Humboldt State University: Argumentation and Critical Thinking Tutorial - Jay VerLinden's resource offering reviews and tests on important concepts in formal logic.
- Logic - An online textbook by Garth Kemerling, explaining the basic elements of elementary logic at an undergraduate level.
- Logic and Mathematics - Essay on the nature of logic and its relationship to the philosophy of mathematics, written by Stephen G. Simpson.
- The Logic Course - An interactive course in formal logic, with tutorials and quizzes on critical thinking, truth-tables, and sentential.
- Nordic Journal of Philosophical Logic (NJPL) - Edited at Dep. of Philosophy, Univ. of Oslo, published by Scandinavian U.P. in hard copy and on WWW. Full-text Web edition free for personal use.
- Peirce's Logic - Article in the Stanford Encyclopaedia of Philosophy, by Eric Hammer.
- PHILOG - The Danish Network for Philosophical Logic and its Applications.
- Philosophical Logic - Introductory article by E. J. Loewe.
- Symbolic Logic - Online resources provided to supplement undergraduate course taught by Peter Suber. Good collection of handouts.
- Tips on Translating English into First-Order Logic - An introductory guide by Peter Suber.
- The Troublesome Paradox - Online version of book seeking publication by Per Lundgren. Author attempts to argue that a consequence of Goedel's incompleteness theorem is that we should overturn our current approach to scientific method.
- Why Aristotelian Logic does not Work - An essay at Abelard.org outlining an argument against Aristotelian syllogistic.
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