3 Sorts of Sort CAL Package
   Several sorting algorithms explained using a nice playing card based interface.
   http://www.csis.ul.ie/modules/cs4111/3sorts/

Backtracking
   A combinatorial puzzle is presented making visible the performance of a backtracking algorithm (requires JavaScript).
   http://www.faust.fr.bw.schule.de/mhb/backtrack/backtren.htm

Graph Animations with Combinatorica
   Animations of several important graph-theoretic topics and algorithms.
   http://www.cs.sunysb.edu/~skiena/combinatorica/animations/

Hope College Animations
   Online animations of algorithms and data structures.
   http://www.cs.hope.edu/alganim/

JFLAP, JAWAA, jeLLRap -- Visual and Interactive Tools
   Tools (Java programs) for visualizing and interacting with theoretical computer science concepts. JAWAA is a tool for creating algorithm animations on the web.
   http://www.cs.duke.edu/~rodger/tools/tools.html

Java Applets for Data Structures and Algorithms
   Demonstrate fundamental concepts in Data Structures and Algorithms.
   http://www.cosc.canterbury.ac.nz/people/mukundan/dsal/appldsal.html

LYDIAN
   Simulation and visualization environment for distributed algorithms that provides students with an experimental environment to test and visualize the behaviour of distributed algorithms.
   http://www.cs.chalmers.se/~lydian/

Leonardo
   An integrated C programming environment for reversible execution and logic-based software visualization developed at the University of Rome "La Sapienza".
   http://www.dis.uniroma1.it/~demetres/Leonardo/

Opsis
   A Java applet designed to teach binary search tree algorithms. It is unique in the way it combines programming, proof, and animation to enhance the learning experience.
   http://opsis.sourceforge.net

Sort Algorithms Visualizer
   Applet and web site for teaching sort algorithms. Includes animation of 11 algorithms and some in-depth studies.
   http://thomas.baudel.name/Visualisation/VisuTri/

The Complete Collection of Algorithm Animations
   An extensive list of links to algorithm animations, primarily Java applets. The list includes an overview of each of the linked algorithms.
   http://www.cs.hope.edu/alganim/ccaa/