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A free cross-platform library of fast C++ routines for the plotting of up to 3-ranged data. It can export to bitmap and vectorEPS/SVG files. There are window interfaces (GLUT/FLTK/Qt) and console tools. MathGL can be used from C/Fortran/Python/Octav/Lua
Automata editor is a vectoreditor for drawing finite automata according to VauCanSon-G format with tools for working with finite automata such as basic algorithms, exporting transition table to LaTeX format and automata work simulation.