FSA Utilities
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The FSA Utilities is an open-source software tool, written in Prolog by Gertjan van Noord, for creating, visualizing, and manipulating Finite state machines. It is useful for constructing finite-state machines from regular expressions and performing standard algorithms such as automata determinization, minimization, and intersection; transducer composition; etc. It includes algorithms for weighted and unweighted finite-state acceptors and transducers. It has a Tcl/TK graphical user interface which allows the user to view and manually manipulate the shapes of small automata and transducers. There is also a Prolog-based macro language which facilitates the construction of complex regular expressions.
