Theoretical

• Computers: Algorithms  (319)
• Science: Math: Applications: Communication Theory: Cryptography  (277)
• Science: Math: Combinatorics  (434)
• Science: Math: Geometry: Computational Geometry  (60)
• Science: Math: Logic and Foundations  (805)

Theoretical Computer Science on the Web   - A directory of resources related to theoretical computer science from Stanford University.

Church-Turing Thesis - Wikipedia article.

Computability Logic - Main web source on the subject: overview, downloadable articles, links.

Computability Theory - Wikipedia article.

CSCI 0510 Models of Computation - Undergraduate computer science course on the foundations of computing at the Brown University, Department of Computer Science.

Interactive Computation - Wikipedia article.

Introduction to Formal Models in Computer Science - Lecture notes from the University of Washington covering basic topics such as computation models and theoretical concepts such as nondeterminism.

Lecture Notes on Theory of Computation - Introduction to basic topics including models of computation, finite automata, context free grammars and complexity theory.

Rusty Spigot Computer Science Notes - Notes on a range of computer science subjects, from the Cambridge undergraduate course.

Theoretical Computer Science Search Engine - A Google Custom Search Engine that searches pages relevant to Theoretical Computer Science, such as books, lecture notes, courses, and papers.

Theory of Computation - Lecture notes for an undergraduate class taught by Leonid Levin at UC Berkeley.