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G.A.V. (Graph Algorithm Visualizer) is a tool that visualizes algorithms from graph theory. A step-by-step visualization from each different algorithm allows the user to understand the particular algorithm very easily.
Pilo Visual Tools for Scheme (Pvts) is a basic interpreter with visual tools for Scheme (LISP). Written in Java, PVTS has an interpreter and three visualization modules: a global environment viewer, a function call viewer, and a data structure viewer.