#unitytips: MenuItem "CONTEXT/<component>" - http://diegogiacomelli.com.br/unitytips-menuitem-context-component

TransformContextMenu.cs

using UnityEditor;
using UnityEngine;

public static class TransformContextMenu
{
    [MenuItem("CONTEXT/Transform/Make a circle")]
    public static void MakeCircle()
    {
        var length = Selection.gameObjects.Length;
        var radius = 5;

        for (int i = 0; i < length; i++)
        {
            var angle = i * Mathf.PI * 2 / length;
            Selection.gameObjects[i].transform.position = new Vector3(Mathf.Cos(angle), 0, Mathf.Sin(angle)) * radius;
        }
    }
}