An Unity Gizmo that displays the origin and orientation of a _game object_ when it is selected in the _Editor_, displaying its right/forward/up as red/blue/green axis

ShowMyTransforms.cs

using UnityEngine;
using System.Collections;

[ExecuteInEditMode]
public class ShowTransforms : MonoBehaviour {
	private const float radius = 0.02f;

	void OnDrawGizmosSelected() {
		Vector3 origin, axisRight, axisForward, axisUp;

		origin = transform.position;
		axisRight = transform.position + transform.right;
		axisForward = transform.position + transform.forward;
		axisUp = transform.position + transform.up;

		Gizmos.color = Color.white;
		Gizmos.DrawSphere( origin, radius);

		Gizmos.color = Color.red;
		Gizmos.DrawLine( origin, axisRight);
		Gizmos.DrawSphere( axisRight, radius);

		Gizmos.color = Color.blue;
		Gizmos.DrawLine( origin, axisForward);
		Gizmos.DrawSphere( axisForward, radius);

		Gizmos.color = Color.green;
		Gizmos.DrawLine( origin, axisUp);
		Gizmos.DrawSphere( axisUp, radius);
	}
}