Offset Curve

Any way to create an offset curve?. 

It's of no use to use bevel, because it doesn't leave me with a real
curve that is editable.

I'm not looking for a way to have a mesh follow a path. I'm looking
for a curve that follows the path of another curve with some space
between.

In mathematics, this is called an offset curve and this is a curve
which is the offset of another. The new curve is the specified
distance from the picked curve in the direction computed by the cross
product of the normal to the specified plane and the local tangent
vector. The distance is set by the distance variable

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