*Winplot, from [http://math.exeter.edu/rparris/winplot.html] (free, but not open source)
*Winplot, from [http://math.exeter.edu/rparris/winplot.html] (free, but not open source)
*Inkscape, from [http://www.inkscape.org/] (free, open source)
*Inkscape, from [http://www.inkscape.org/] (free, open source)
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We do not have much experience with these, and would appreciate feedback on them (perhaps with examples of uploaded diagrams), or suggestions for other packages.
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:::There is a helpful page on using Inkscape to make technical diagrams [http://en.wikipedia.org/wiki/Wikipedia:How_to_draw_a_diagram_with_Inkscape here].
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We do not have much experience with these packages, and would appreciate feedback on them (perhaps with examples of uploaded diagrams), or suggestions for other packages.