How to find the formulas for a "perfect-bell" curve between 0-1?

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I would like to have a formula to generate the curves shown in the following plot:

enter image description here

The magnitude of curvature should be adjusted by a parameter. Does there exist any well-known function or distribution to define such curves?

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How about $(1-(1-x)^p)^{1/p}$? These are symmetric across the line $y = 1 - x$.

For $p=1, 2, 3, 4, 5$ (moving up and to the left as $p$ increases): Mathematica graphics