Added new utility: Measure 1.0.

Measure/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+    </startup>
+</configuration>

Measure/Measure.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{C32135A3-AFBB-4A3D-8AC6-B07CF94BBCBD}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Measure</RootNamespace>
+    <AssemblyName>Measure</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Deployment" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Overlay.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="Properties\Strings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Strings.resx</DependentUpon>
+    </Compile>
+    <EmbeddedResource Include="Properties\Strings.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Strings.Designer.cs</LastGenOutput>
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

Measure/Overlay.cs

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+using System;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Measure
+{
+    class Overlay : Form
+    {
+        Point start;
+        Point end;
+        bool drawing;
+
+        Pen linePen = new Pen(new SolidBrush(Color.FromArgb(255, Color.Magenta)), 1);
+        Font Segoe = new Font("Segoe UI", 11, FontStyle.Regular);
+
+        Bitmap screenshot = null;
+
+        public Overlay()
+        {
+            this.WindowState = FormWindowState.Maximized;
+            this.FormBorderStyle = FormBorderStyle.None;
+            this.BackColor = Color.Black;
+            this.DoubleBuffered = true;
+
+            this.MouseDown += Overlay_MouseDown;
+            this.MouseUp += Overlay_MouseUp;
+            this.MouseMove += Overlay_MouseMove;
+            this.Paint += Overlay_Paint;
+            this.KeyUp += Overlay_KeyUp;
+
+        }
+
+        private void InitializeComponent()
+        {
+            this.Name = "Measure";
+            this.ShowInTaskbar = false;
+            this.ResumeLayout(false);
+        }
+
+        /// <summary>
+        /// Set start point as we initially click
+        /// </summary>
+        private void Overlay_MouseDown(object sender, MouseEventArgs e)
+        {
+            start = e.Location;
+            drawing = true;
+        }
+
+        /// <summary>
+        /// Stop drawing as we release the mouse.
+        /// </summary>
+        private void Overlay_MouseUp(object sender, MouseEventArgs e)
+        {
+            drawing = false;
+        }
+
+        /// <summary>
+        /// If we're drawing and moving the mouse, we set the end point to the current cursor location.
+        /// </summary>
+        private void Overlay_MouseMove(object sender, MouseEventArgs e)
+        {
+            if (drawing)
+            {
+                end = e.Location;
+                // Cause active area of form to be redrawn
+                this.Invalidate();
+            }
+        }
+
+        /// <summary>
+        /// Draw
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void Overlay_Paint(object sender, PaintEventArgs e)
+        {
+            // Vertical line
+            e.Graphics.DrawLine(linePen, start.X, start.Y, start.X, end.Y);
+
+            // Horizontal line
+            e.Graphics.DrawLine(linePen, start.X, end.Y, end.X, end.Y);
+
+            // Diagonal line
+            e.Graphics.DrawLine(linePen, start.X, start.Y, end.X, end.Y);
+
+            // Boxes to show end points
+            e.Graphics.FillPolygon(Brushes.LimeGreen, PointToBox(start));
+            e.Graphics.FillPolygon(Brushes.LimeGreen, PointToBox(end));
+
+            // Text coordinates of start- and endpoints.
+            e.Graphics.DrawString(SimpleCoords(start), Segoe, Brushes.White, start);
+            e.Graphics.DrawString(SimpleCoords(end), Segoe, Brushes.White, end);
+
+            // Line lengths
+            // Width
+            int dx = end.X - start.X;
+            e.Graphics.DrawString(Math.Abs(dx) + "px", Segoe, Brushes.White, start.X + dx / 2, end.Y);
+
+            // Height
+            int dy = end.Y - start.Y;
+            e.Graphics.DrawString(Math.Abs(dy) + "px", Segoe, Brushes.White, start.X, start.Y + dy / 2);
+
+            // Hypotenuse length
+            double hyp = Math.Round(Math.Sqrt(dx * dx + dy * dy), 0, MidpointRounding.AwayFromZero);
+            e.Graphics.DrawString(hyp + "px", Segoe, Brushes.White, start.X + dx / 2, start.Y + dy / 2);
+
+        }
+
+        /// <summary>
+        /// Capture the escape or Q keys to exit.
+        /// </summary>
+        private void Overlay_KeyUp(object sender, KeyEventArgs e)
+        {
+            if (e.KeyCode == Keys.Escape || e.KeyCode == Keys.Q)
+            {
+                this.DialogResult = DialogResult.OK;
+                this.Close();
+            }
+        }
+
+        /// <summary>
+        /// Convert a single point into a 5x5 pixel box
+        /// </summary>
+        /// <param name="point">Point to centre box on.</param>
+        /// <returns>An array of points making a 5x5 rectangle centred on a specified point.</returns>
+        private Point[] PointToBox(Point point)
+        {
+            return new Point[] {
+                new Point(point.X - 2, point.Y - 2 ),
+                new Point(point.X + 2, point.Y - 2 ),
+                new Point(point.X + 2, point.Y + 2 ),
+                new Point(point.X - 2, point.Y + 2 )
+            };
+        }
+
+        /// <summary>
+        /// Override the background painting to fake a translucent form background.
+        /// Draw instructions at this point to avoid redrawing every frame.
+        /// </summary>
+        protected override void OnPaintBackground(PaintEventArgs e)
+        {
+            // Take screenshot the first time. Won't update the screen, but otherwise it fades to black every frame as we take successively darker screenshots.
+            if (screenshot == null)
+            {
+                using (Image image = new Bitmap(this.Width, this.Height))
+                {
+                    using (Graphics Surface = Graphics.FromImage(image))
+                    {
+                        var BackgroundBrush = new SolidBrush(Color.FromArgb(128, Color.Black));
+                        var DarkerBrush = new SolidBrush(Color.FromArgb(192, Color.Black));
+
+                        Surface.CopyFromScreen(0, 0, 0, 0, this.Size);
+                        Surface.FillRectangle(BackgroundBrush, this.DisplayRectangle);
+
+                        // Measure and draw instructions. Draw a darker rectangle behind them.
+                        Size TextSize = ExpandSize(Size.Round(e.Graphics.MeasureString(Properties.Strings.Instructions, Segoe)), 5);
+                        Point TextOrigin = Point.Round(new PointF(this.Width / 2 - TextSize.Width / 2, this.Height - TextSize.Height - 10));
+                        var TextBox = new Rectangle(TextOrigin, TextSize);
+                        Surface.FillRectangle(DarkerBrush, TextBox);
+                        Surface.DrawString(Properties.Strings.Instructions, Segoe, Brushes.White, TextBox);
+
+                    }
+                    screenshot = new Bitmap(image);
+                }
+            }
+            e.Graphics.DrawImage(screenshot, 0, 0);
+        }
+
+        /// <summary>
+        /// Get shorter version of the coordinates of a Point (or PointF).
+        /// </summary>
+        /// <param name="point">Point to return coords of.</param>
+        /// <returns>Coordinates in the format "X,Y".</returns>
+        public string SimpleCoords(PointF point)
+        {
+            return point.X + "," + point.Y;
+        }
+
+        /// <summary>
+        /// Expand a given size by a given amount.
+        /// </summary>
+        /// <param name="size">Size to base our new size on.</param>
+        /// <param name="expandBy">Amount to change dimensions by.</param>
+        public Size ExpandSize(Size size, int expandBy)
+        {
+            return new Size(size.Width + expandBy, size.Height + expandBy);
+        }
+
+    }
+}

Measure/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Measure
+{
+    static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new Overlay());
+        }
+    }
+}

Measure/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Measure")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Measure")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("c32135a3-afbb-4a3d-8ac6-b07cf94bbcbd")]
+
+
+[assembly: AssemblyVersion("1.0.*")]

Measure/Properties/Settings.settings

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+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>