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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 trandsucers. There is also a Prolog-based macro language which facilitates the construction of complex regular expressions.
The FSA Utilities is freely distributed by Geertan van Noord under the GNU General Public License.