Graph is a piece of freeware available at http://www.padowan.dk/graph/Download.php that allows you map functions simply by inputting an equation.

Top features;
Fantastically easy to use and navigate
Inbuilt functions such as sin, cos and log for ease of use.
Can evaluate the area under a graph between two intervals (i.e. integrate)
Input cartesian, polar or parametric equations

I have this freeware particularly useful when trying to 'visualise' mathematics problems especially ones using trigonometric or exponential functions. As freeware I would give it 4.5/5 easily.

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