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I want to align (make parallel) any of the 3 local axes with an edge. How can this be done? Can such an axes system be made available outside the object the edge belongs to?

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Yes, you can have any number of custom transform orientations. You create a transform orientation by selecting either a vertex, edge or face and in the Tool Properties panel (N) at the bottom, expand the Transform Orientations tab. The plus sign will add a new orientation based on the currently selected element in the scene.

It's a good idea to name these orientations if you plan to reuse them, else that list can get confusing.

This Transform orientation can then be selected from the drop downs in that same panel, or in the 3dView header. Because they persist in the .blend they can be recalled at any later stage.

Also see this answer, which covers much of the same

Limitations

(Dec 2015) You can't make a Transform Orientation using a Curve Object's Point or Segment.

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  • $\begingroup$ Unfortunately setting the axis using two points does not work with two control points of a NURBS-curve, only with two vertices. $\endgroup$ – TavernSenses Dec 15 '15 at 17:56
  • $\begingroup$ I do believe i wrote that already. $\endgroup$ – zeffii Dec 15 '15 at 20:26
  • $\begingroup$ God this is SO useful! I just did a loop cut into the direction I wanted the axis to be. Easy. $\endgroup$ – C4d Feb 19 '18 at 14:43

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