Using Components, you can add some functionality to the spline without any scripting. Components are standard MonoBehaviour subclasses. Also, use component's code as an example to develop your own custom components.

Math component gives you access to math functions. Currently 4 functions are supported
1) get spline's length
2) get position
3) get tangent and
4) get position and distance of a point on the spline, which is closest to a given point

Create a set of Box Colliders along 3D spline.

Create a set of 2D Box Colliders along 2D spline.

Fill points of 2D Edge Collider along 2D spline.

Move/Rotate/Scale some object with single component.

Visualize the spline with LineRenderer Unity's component in Play mode.

Triangulate 2D spline (simple polygons only).

Split spline to polyline.

Sweep a line or 2D spline (profile) along another 2D spline.

Identify the distance along the spline.

Moves an object to the cursor position every frame

Rotates an object according to the spline's tangent or custom field value at the position, defined by a cursor

Scales the object, based on custom field value, defined by a cursor position

Change cursor position linearly every frame