Although GraphSight Junior is freeware, it requires registration. You have to pay nothing for it, just navigate to:
and follow the further instructions to get your free license key for GraphSight Junior.
AT YOUR SERVICEGraphSight - the handy 2D math graphing and curve fitting software for scientists, teachers, engineers and students.
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GraphSight Junior - the simple freeware 2D math plotting utility for students and teachers.