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A formal proof generator for the system of Fitch. Apart from Fitch diagrams it can also be used to generate truth tables or tree diagrams. Good support for hints and single-stepping. This program is used as the engine behind http://logica.ewi.tudelft.nl.
An applet that helps teachers or anyone else to perform tasks on logic expressions that would require quite a lot of human time to manage. This program includes conversions between infix, prefix and postfix notations, and displaying of syntax tree.