GameObjectCreator

using UnityEngine;
using UnityEditor;

//Put this under a folder called Editor in your project
public class EmptyGOCreator
{
  [MenuItem ("GameObject/Create Empty at level %g")]
	static void CreateEmptyGOAtLevel () 
	{
		var go = new GameObject("GameObject");
		go.transform.parent = Selection.activeGameObject == null ? null : Selection.activeGameObject.transform.parent;
		go.transform.position = Vector3.zero;
	}

	[MenuItem ("GameObject/Create Empty below level %k")]
	static void CreateEmptyGOAsChild() 
	{
		var go = new GameObject("GameObject");
		go.transform.parent = Selection.activeGameObject == null ? null : Selection.activeGameObject.transform;
		go.transform.position = Vector3.zero;
	}
}