add hyper links.

src/Avalonia.Dialogs/AboutAvaloniaDialog.xaml

@@ -73,6 +73,14 @@
         <TextBlock Text="Development Build" Margin="0,-10,0,0" FontSize="15" Foreground="White" />
       </StackPanel>
     </StackPanel>
-    <TextBlock Text="" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="5" FontSize="15" />
+    <StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Center" Spacing="20" Margin="0 60 0 0">
+      <TextBlock Text="This product is built with the Avalonia cross platform UI Framework." TextWrapping="Wrap" HorizontalAlignment="Center" />
+      <Button Cursor="Hand" Background="Transparent" BorderThickness="0" Foreground="#419df2" Command="{Binding OpenGithub}" Content="https://github.com/AvaloniaUI/Avalonia" HorizontalAlignment="Center" />
+      <Button Cursor="Hand" Background="Transparent" BorderThickness="0" Foreground="#419df2" Command="{Binding OpenWebsite}" Content="https://www.avaloniaui.net/" HorizontalAlignment="Center" />
+    </StackPanel>
+    <StackPanel VerticalAlignment="Bottom">
+      <TextBlock Text="© 2019 AvaloniaUI OÜ (14839404)" TextWrapping="Wrap" HorizontalAlignment="Center" />
+      <TextBlock Text="" HorizontalAlignment="Right" Margin="5" FontSize="15" />
+    </StackPanel>
   </Grid>
-</Window>
+</Window>

src/Avalonia.Dialogs/AboutAvaloniaDialog.xaml.cs

@@ -1,6 +1,8 @@
 // Copyright (c) The Avalonia Project. All rights reserved.
 // Licensed under the MIT license. See licence.md file in the project root for full license information.
 
+using System.Diagnostics;
+using System.Runtime.InteropServices;
 using Avalonia.Controls; 
 using Avalonia.Markup.Xaml;
 
@@ -11,6 +13,59 @@ namespace Avalonia.Dialogs
         public AboutAvaloniaDialog()
         {
             AvaloniaXamlLoader.Load(this);
+
+            DataContext = this;
+        }
+
+        public void OpenGithub ()
+        {
+            OpenBrowser("https://github.com/AvaloniaUI/Avalonia/");
+        }
+
+        public void OpenWebsite ()
+        {
+            OpenBrowser("https://avaloniaui.net/");
+        }
+
+        private static void OpenBrowser(string url)
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                // If no associated application/json MimeType is found xdg-open opens retrun error
+                // but it tries to open it anyway using the console editor (nano, vim, other..)
+                ShellExec($"xdg-open {url}", waitForExit: false);
+            }
+            else
+            {
+                using Process process = Process.Start(new ProcessStartInfo
+                {
+                    FileName = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? url : "open",
+                    Arguments = RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? $"-e {url}" : "",
+                    CreateNoWindow = true,
+                    UseShellExecute = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
+                });
+            }
+        }
+
+        private static void ShellExec(string cmd, bool waitForExit = true)
+        {
+            var escapedArgs = cmd.Replace("\"", "\\\"");
+
+            using var process = Process.Start(
+                new ProcessStartInfo
+                {
+                    FileName = "/bin/sh",
+                    Arguments = $"-c \"{escapedArgs}\"",
+                    RedirectStandardOutput = true,
+                    UseShellExecute = false,
+                    CreateNoWindow = true,
+                    WindowStyle = ProcessWindowStyle.Hidden
+                }
+            );
+            if (waitForExit)
+            {
+                process.WaitForExit();
+            }
         }
     }
 }