- Ariadne's Thread
 - Critical examinations of ethical controversies including topics like abortion, hate speech, and justice. - Association for Symbolic Logic
- International organisation supporting the presentation, publication, and critical discussion of scholarly work in the field of logic.
- Centre for Logic and Philosophy of Science
- Focuses on research in paraconsistent logic, inconsistency-adaptive logic, non-standard logic, causal explanation, scientific discovery, and methodology.
- Critical Reasoning Tutorial
- Interactive tutorial aimed at introducing students to the basics of argument structure and logic.
- Factasia Logic
- Technical and philosophical information concerning symbolic logic and its applications.
- Fallacy Files, The
- Describes and gives examples of logical fallacies from the media and everyday life.
- Logical Fallacies
- Explores and defines errors of reasoning.
- Logician, The
- Features logic, philosophy, epistemology, phenomenology, psychology, and theology writings by Avi Sion, Ph.D.
- Mission: Critical
- Interactive college-level virtual lab that teaches the basic concepts of critical thinking and informal logic, such as induction, deduction and fallacies.
- Nizkor Project: Fallacies
- Describes several logical fallicies.
- On the Model Theory of Knowledge
- Offers a language for expressing the operator 'knowing that' with axioms and rules of inference and a Kripke type of semantics.
- Papers on Probabilistic Logic
- Features articles by Richard Jeffrey and John Dorling.
- Stephen's Guide to the Logical Fallacies
- Describing errors of reasoning which may be recognised and corrected by prudent thinkers.
- Wikipedia: Modal Logic
- User-created article explaining modal logic, the logic of possibility. Explains the difference between modal and other logics, modal operators, the formal rules of modal logic, and the development of the system.
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