Computability and Complexity in Analysis Network
- The CCA Network provides some useful information for researchers working in the field of computability and complexity in analysis.
- http://www.cca-net.de/

Open Questions in Recursion Theory
- Compiled by Theodore A. Slaman, Berkeley [TeX/PDF].
- http://math.berkeley.edu/~slaman/qrt/

Computability Logic - Wictionary
- A dictionary definition of the subject.
- http://en.wiktionary.org/wiki/Computability_logic

Interactive Computation
- Wikipedia article.
- http://en.wikipedia.org/wiki/Interactive_computation

Computability Logic
- Encyclopedia article.
- http://www.sciencedaily.com/encyclopedia/computability_logic

Introduction to Logic and Recursion Theory
- Notes from the class taught by Prof. Sacks in the Spring of 1998.
- http://www.media.mit.edu/physics/pedagogy/babbage/texts/rt.html

Church-Turing Thesis
- Alonzo Church and Alan Turing formulated the thesis that computability coincides with recursivity; by Jack Copeland.
- http://plato.stanford.edu/entries/church-turing/

Hypercomputation Research Network
- The study of computation beyond that defined by the Turing machine, also known as super-Turing, non-standard or non-recursive computation. Links to people, resources and discussions.
- http://www.hypercomputation.net/

Problem Solving Environments Home Page
- This site contains information about Problem Solving Environments (PSEs), research, publications, and information on topics related to PSEs.
- http://www-cgi.cs.purdue.edu/cgi-bin/acc/pses.cgi

Computability and Complexity
- An online course on complexity.
- http://www.csc.liv.ac.uk/~ped/teachadmin/algor/comput_complete.html

Bibliographic Database for Computability Theory
- Extensive bibliography on computability and recursion theory, maintained by Peter Cholak.
- http://www.nd.edu/~cholak/computability/bib/bib.html

Computability Theory
- Directory of researchers working in computability theory, and list of open problems.
- http://www.nd.edu/~cholak/computability/computability.html