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http://www.win.tue.nl/math/eidma/
(Netherlands) Euler Institute for Discrete Mathematics and its Applications (EIDMA)Discrete Algebra and Geometry, Coding Theory, Information Theory and Cryptology, Combinatorial Optimization and Algorithms, Graph Theory.
http://sigact.acm.org/
Special Interest Group on Algorithms and Computation Theory, the ACM special interest group for Theoretical Computer Science. Site has membership information, meetings, reports and a newsletter for members.
http://www.nist.gov/dads/
A dictionary of algorithms, algorithmic techniques, data structures, and archetypical problems, with related definitions. Many entries have links to implementations, tutorials, and bibliographical references.
http://www-gap.dcs.st-and.ac.uk/
Group at the University of St. Andrews developing GAP, a free system for computational discrete algebra.
http://www.combinatorics.org/
A refereed all-electronic journal that welcomes papers in all branches of discrete mathematics. Full text is available free on-line.
The Visible Human Project has many medical images.
http://www.princeton.edu/~verdu/
Rate-distortion theory, source coding. Professor at Princeton.
http://algo.inria.fr/
(France) INRIARocquencourt, Versailles. Algorithms Project. Interests in design and analysis of algorithms, computer algebra, combinatorial analysis and asymptotics.
(USA) Massachusetts Institute of Technology (MIT)The Algorithms Group, part of the Theory of Computation (TOC) group in the Computer Science and Artificial Intelligence Laboratory (CSAIL). People and research projects.
http://www.cs.umd.edu/areas/Theory
(USA) University of Maryland, College ParkAlgorithms and Theory Group. Members, research projects.
http://www.nada.kth.se/~viggo/wwwcompendium/
By P. Crescenzi and V. Kann; KTH Stockholm. A continuously updated version of the appendix from the book Complexity and Approximation (Springer, 1999).
http://www.eecs.umich.edu/gasm/
A formal method for specifying and verifying algorithms. Tools, meetings, researchers in the area.
http://alumnus.caltech.edu/~madler/
Works at JPL. Information-ZIP, gzip, zlib, and PNG.
http://www.cs.umd.edu/~mount/ALENEX02/
4th Workshop on Algorithm Engineering and Experiments. San Francisco, CA, USA; 4--5 January 2002.