- Classical Logic - Introduction to classical logic, including completeness and Löwenheim-Skolem theorems; by Stewart Shapiro.
- Computability Logic Homepage - Main online source on computability logic - a recently emerged formal theory of computational tasks and resources. Maintained by G.Japaridze.
- Introduction to Mathematical Logic - Hyper-textbook for students by V. Detlovs and K. Podnieks.
- Logic - Open Encyclopedia entry. Hierarchically organized by subareas.
- Logic - Wikipedia article.
- Math Front: LO Logic - Front end for the logic section of the mathematics e-print arXiv.
- Mathematical Logic and Foundations - From The Mathematical Atlas, a resource of mathematics maintained by David Rusin. Extensive resources related to logic and set theory.
- Mathematical Logic around the World - A rich collection of links to logic-related websites.
- Mind Versus Goedel by Damjan Bojadziev - Compares the mind to advanced computers and artificial intelligence, as Goedel would possibly view them.
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