Initial commit: .NET MAUI Linux Platform

Complete Linux platform implementation for .NET MAUI with:

- 35+ Skia-rendered controls (Button, Label, Entry, CarouselView, etc.)
- Platform services (Clipboard, FilePicker, Notifications, DragDrop, etc.)
- Accessibility support (AT-SPI2, High Contrast)
- HiDPI and Input Method support
- 216 unit tests
- CI/CD workflows
- Project templates
- Documentation

🤖 Generated with Claude Code

templates/Microsoft.Maui.Linux.Templates.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <PackageType>Template</PackageType>
+    <PackageVersion>1.0.0-preview.4</PackageVersion>
+    <PackageId>Microsoft.Maui.Linux.Templates</PackageId>
+    <Title>.NET MAUI Linux Project Templates</Title>
+    <Authors>MAUI Linux Community Contributors</Authors>
+    <Description>Project templates for building .NET MAUI applications on Linux desktop.</Description>
+    <PackageTags>dotnet-new;templates;maui;linux;desktop</PackageTags>
+    <PackageProjectUrl>https://github.com/dotnet/maui</PackageProjectUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+
+    <TargetFramework>netstandard2.0</TargetFramework>
+
+    <IncludeContentInPack>true</IncludeContentInPack>
+    <IncludeBuildOutput>false</IncludeBuildOutput>
+    <ContentTargetFolders>content</ContentTargetFolders>
+    <NoWarn>$(NoWarn);NU5128</NoWarn>
+    <NoDefaultExcludes>true</NoDefaultExcludes>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Content Include="maui-linux-app\**\*" Exclude="maui-linux-app\**\bin\**;maui-linux-app\**\obj\**" />
+    <Compile Remove="**\*" />
+  </ItemGroup>
+
+</Project>

templates/maui-linux-app/.template.config/template.json

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+{
+  "$schema": "http://json.schemastore.org/template",
+  "author": "MAUI Linux Community",
+  "classifications": ["MAUI", "Linux", "Desktop", "App"],
+  "identity": "Microsoft.Maui.Linux.App",
+  "name": ".NET MAUI Linux Application",
+  "shortName": "maui-linux",
+  "tags": {
+    "language": "C#",
+    "type": "project"
+  },
+  "sourceName": "MauiLinuxApp",
+  "preferNameDirectory": true,
+  "symbols": {
+    "Framework": {
+      "type": "parameter",
+      "description": "The target framework for the project.",
+      "datatype": "choice",
+      "choices": [
+        {
+          "choice": "net9.0",
+          "description": "Target .NET 9.0"
+        },
+        {
+          "choice": "net8.0",
+          "description": "Target .NET 8.0"
+        }
+      ],
+      "defaultValue": "net9.0",
+      "replaces": "net9.0"
+    },
+    "DisplayServer": {
+      "type": "parameter",
+      "description": "The display server to use.",
+      "datatype": "choice",
+      "choices": [
+        {
+          "choice": "auto",
+          "description": "Auto-detect display server"
+        },
+        {
+          "choice": "x11",
+          "description": "Force X11"
+        },
+        {
+          "choice": "wayland",
+          "description": "Force Wayland"
+        }
+      ],
+      "defaultValue": "auto"
+    },
+    "skipRestore": {
+      "type": "parameter",
+      "datatype": "bool",
+      "description": "Skip automatic restore after project creation.",
+      "defaultValue": "false"
+    }
+  },
+  "primaryOutputs": [
+    { "path": "MauiLinuxApp.csproj" }
+  ],
+  "postActions": [
+    {
+      "condition": "(!skipRestore)",
+      "description": "Restore NuGet packages required by this project.",
+      "manualInstructions": [{ "text": "Run 'dotnet restore'" }],
+      "actionId": "210D431B-A78B-4D2F-B762-4ED3E3EA9025",
+      "continueOnError": true
+    }
+  ]
+}

templates/maui-linux-app/App.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.Maui.Controls;
+
+namespace MauiLinuxApp;
+
+public class App : Application
+{
+    public App()
+    {
+        MainPage = new MainPage();
+    }
+}

templates/maui-linux-app/MainPage.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
+
+namespace MauiLinuxApp;
+
+public class MainPage : ContentPage
+{
+    private int _count = 0;
+    private readonly Label _counterLabel;
+
+    public MainPage()
+    {
+        Title = "MauiLinuxApp";
+
+        _counterLabel = new Label
+        {
+            Text = "Click the button",
+            HorizontalOptions = LayoutOptions.Center,
+            FontSize = 18
+        };
+
+        var button = new Button
+        {
+            Text = "Click me",
+            HorizontalOptions = LayoutOptions.Center
+        };
+        button.Clicked += OnCounterClicked;
+
+        var image = new Image
+        {
+            Source = "dotnet_bot.png",
+            HeightRequest = 200,
+            HorizontalOptions = LayoutOptions.Center
+        };
+
+        Content = new VerticalStackLayout
+        {
+            Spacing = 25,
+            Padding = new Thickness(30, 0),
+            VerticalOptions = LayoutOptions.Center,
+            Children =
+            {
+                new Label
+                {
+                    Text = "Hello, .NET MAUI on Linux!",
+                    FontSize = 32,
+                    HorizontalOptions = LayoutOptions.Center
+                },
+                image,
+                _counterLabel,
+                button
+            }
+        };
+    }
+
+    private void OnCounterClicked(object? sender, EventArgs e)
+    {
+        _count++;
+        _counterLabel.Text = _count == 1 ? "Clicked 1 time" : $"Clicked {_count} times";
+    }
+}

templates/maui-linux-app/MauiLinuxApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <RootNamespace>MauiLinuxApp</RootNamespace>
+    <AssemblyName>MauiLinuxApp</AssemblyName>
+    <ApplicationTitle>MauiLinuxApp</ApplicationTitle>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <!-- .NET MAUI Linux Platform -->
+    <PackageReference Include="Microsoft.Maui.Controls.Linux" Version="1.0.0-preview.4" />
+
+    <!-- Core MAUI packages -->
+    <PackageReference Include="Microsoft.Maui.Controls" Version="9.0.40" />
+    <PackageReference Include="Microsoft.Maui.Graphics" Version="9.0.40" />
+  </ItemGroup>
+
+  <!-- Embed Resources -->
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\**\*" />
+  </ItemGroup>
+
+</Project>

templates/maui-linux-app/Program.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.Maui.Platform.Linux;
+
+namespace MauiLinuxApp;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        var app = LinuxApplication.CreateBuilder()
+            .UseApp<App>()
+            .Build();
+
+        app.Run();
+    }
+}