A custom Inspector for Unity's Transform component to make it nicer when working on 2D games.

TransformEditor2D.cs

using UnityEngine;
using UnityEditor;

[CanEditMultipleObjects, CustomEditor(typeof(Transform))]
public class TransformEditor2D : Editor
{
    public override void OnInspectorGUI()
    {
        Transform transform = (Transform)target;

        Vector3 position = EditorGUILayout.Vector2Field("Position", transform.localPosition);
        Vector3 rotation = new Vector3(0, 0, EditorGUILayout.FloatField("Rotation", transform.localEulerAngles.z));
        Vector3 scale = EditorGUILayout.Vector2Field("Scale", transform.localScale);

        if (GUI.changed)
        {
            Undo.RecordObject(transform, "Transform Changed");
            transform.localPosition = position;
            transform.localEulerAngles = rotation;
            transform.localScale = scale;
        }
    }
}