The publication covered the following points:

Displays icons and text on the object in the scene;
Displaying text or icons in the Project;
Template created scripts;
Opening and creating a project through Explorer context menu;
Adding subscribers to the event in the inspector.

To reduce code in some scripts in all the fields made public.

1. Displays icons and text on the object in the scene

Name or icon can display the built-in editor: Gizmo and Icon Display Controls.

Icon can also be displayed using the method Gizmos.DrawIcon. The icon file must be located in the folder "Assets / Gizmos".

public class IconExample : MonoBehaviour
{
    void OnDrawGizmos()
    {
        Gizmos.DrawIcon(transform.position, "Icon.png", true);
    }
} 

If you want to display your text, you can use the following code:

public static class GizmosUtils
{
    public static void DrawText(GUISkin guiSkin, string text, Vector3 position, Color? color = null, int fontSize = 0, float yOffset = 0)
    {
#if UNITY_EDITOR
        var prevSkin = GUI.skin;
        if (guiSkin == null)
            Debug.LogWarning("editor warning: guiSkin parameter is null");
        else
            GUI.skin = guiSkin;

        GUIContent textContent = new GUIContent(text);

        GUIStyle style = (guiSkin != null) ? new GUIStyle(guiSkin.GetStyle("Label")) : new GUIStyle();
        if (color != null)
            style.normal.textColor = (Color)color;
        if (fontSize > 0)
            style.fontSize = fontSize;

        Vector2 textSize = style.CalcSize(textContent);
        Vector3 screenPoint = Camera.current.WorldToScreenPoint(position);

        if (screenPoint.z > 0) // checks necessary to the text is not visible when the camera is pointed in the opposite direction relative to the object
        {
            var worldPosition = Camera.current.ScreenToWorldPoint(new Vector3(screenPoint.x - textSize.x * 0.5f, screenPoint.y + textSize.y * 0.5f + yOffset, screenPoint.z));
            UnityEditor.Handles.Label(worldPosition, textContent, style);
        }
        GUI.skin = prevSkin;
#endif
    }
} 

public class GizmosTextExample : MonoBehaviour
{
    public float yOffset = 16;
    public Color textColor = Color.cyan;
    public int fontSize = 12;

    private void OnDrawGizmos()
    {
        GizmosUtils.DrawText(GUI.skin, "Custom text", transform.position, textColor, fontSize, yOffset);
    }
}

2. Displaying text or icons in the Project window

To do this, use the delegate EditorApplication.projectWindowItemOnGUI.
The following example is slightly edited the code found on the link: Extending the editor: Project window.

[InitializeOnLoad]
internal class CustomProjectWindow
{
    static readonly  Color labelColor = new Color(0.75f, 0.75f, 0.75f, 1.0f);

    static CustomProjectWindow()
    {
        EditorApplication.projectWindowItemOnGUI += OnProjectWindowGUI;
    }
     
    static void OnProjectWindowGUI(string pGUID, Rect pDrawingRect)
    {
        string assetpath = AssetDatabase.GUIDToAssetPath(pGUID);
        string extension = Path.GetExtension(assetpath);
        bool icons = pDrawingRect.height > 20;

        if (icons || assetpath.Length == 0)
            return;

        GUIStyle labelStyle = new GUIStyle(EditorStyles.label);
        Vector2 labelSize = labelStyle.CalcSize(new GUIContent(extension));
        
        Rect newRect = pDrawingRect;
        newRect.width += pDrawingRect.x;
        newRect.x = newRect.width - labelSize.x - 4;

        Color prevGuiColor = GUI.color;
        GUI.color = labelColor;
        GUI.Label(newRect, extension, labelStyle);
        GUI.color = prevGuiColor;
    }
}

3. Templates to create scripts

When creating a new script in the Project, for it is possible to select one of the existing templates scripts.
If you want to create a new script, it has already been written by any particular code, the data can be pre-edit templates or create your own.

Templates are usually located in the following folders:

Windows: \ Program Files \ Unity \ Editor \ Data \ Resources \ ScriptTemplates
OS X: /Applications/Unity/Unity.app/Contents/Resources/ScriptTemplates

Describe the parameters in the template name "81-C # Script-NewBehaviourScript.cs:
"81" - the serial number of the template in the context menu;
C # Script - the display name in the context menu;
NewBehaviourScript - credit default name of the generated script.

4. Opening and creating a project through Explorer context menu

In Windows Explorer, you can add items to create and open an existing project Unity3D.
Ready registry files can be downloaded here (Tip # 63 Tip # and 71):

5. Adding subscribers to the event inspector

Sample code to create an object after a specified period of time:

public class InvokeRepeating : MonoBehaviour
{
    public UnityEvent onInvoke;
    public float repeatTime = 3f;
    public float startTime = 1f;

    void Start()
    {
        InvokeRepeating("Execute", startTime, repeatTime);
    }

    void Execute()
    {
        onInvoke.Invoke();
    }
}

public class CreateObject : MonoBehaviour
{
    public Transform Prefab;

    public void Execute()
    {
        Instantiate(Prefab, transform.position, transform.rotation);
    }
}

I hope this publication will be useful to you.

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