Directories

Logic Links - Gustavus Philosophy Department.
http://gustavus.edu/academics/philosophy/llogic.html

Logic and Set Theory - Groups and conferences.
http://www.math.ufl.edu/~jal/orgs.html

Computability Theory - Information on this site includes a Bibliographic Database for Computability Theory, a list of Open Questions in Recursion Theory as well as links to many researchers working in the field. Maintained by Peter Cholak.
http://www.nd.edu/~cholak/computability/computability.html

Logic and Set Theory - Category of Topics in Mathematics (MathArchives).
http://archives.math.utk.edu/topics/logic.html

Research groups in Logic and Theoretical Computer Science - Maintained by Anton Setzer, University of Wales Swansea.
http://www.cs.swan.ac.uk/~csetzer/logic-server/

Knowledge Representation - With Automated Reasoning, Computational Logics and Advanced Databases. Projects, people, conferences and specific resources.
http://www.inf.unibz.it/~franconi/kr.html

ASL members - List of web pages of Association for Symbolic Logic members. Maintained by Herbert Enderton.
http://www.math.ucla.edu/~hbe/aslweb.html

Mathematical Logic and Foundations - Section of Math Guide.
http://www.mathguide.de/cgi-bin/ssgfi/anzeige.pl?db=math&sc=03

Mathematical Logic Around the World - Compilation of links by Boris Piwinger.
http://world.logic.at/

Description Logics - Maintained by Carsten Lutz.
http://dl.kr.org/

Logic Page - Maintained by Christian Gottschall, Vienna philosophy department.
http://logik.phl.univie.ac.at/~chris/logic.html