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Fuzzy numbers and basic fuzzy arithmetics (+, -, *, /, 1/x) implementation written in Java. Should be used as a library, but it also has a GUI which demonstrates its capabilities (using SWT widgets).
Triple-A (Automatic Analysis with Automata) is a full-featured library for (finite) automata written in Java with two powerful analysis tools (dealing with LTL model checking and Presburger arithmetics) and a graphical user interface built around it.
This Java library (currently 217 classes) is able to handle quantities in terms of basic arithmetics, conversion to similar units, serialization. As framework it allows to create new dimensions and units by inheritance.