The following programs are fully functional and free for all to use.

dfd  Graph Explorer 2.1 dfd


A FREE graph plotting program. Enter a symbolic expression and see the corresponding polar or cartesian graph. Zoom-in, zoom-out and paste the graphs into other documents.

Download 650Kb


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dfd   dfdf
dfd  SimSolve 2.1 dfd


A fast, general purpose and FREE simultaneous equation solver. Just specify the number of variables, enter the coefficients, and press solve. Reports the numerical solution if only one exists, describes the constraints if infinite solutions exist, and tells you it's impossible if no solution exists. The "show workings" mode explains how the program came to its conclusions.

Download 250Kb

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dfd   dfd

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