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window_manager can help you develop desktop gadgets for Windows.

# pubspec.yaml
dependencies:
  window_manager: ^last_version

// lib/main.dart

import 'package:flutter/material.dart';
import 'package:window_manager/window_manager.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await windowManager.ensureInitialized();

  WindowOptions windowOptions = WindowOptions(
    size: Size(800, 600),
    center: true,
    alwaysOnTop: true,
    titleBarStyle: TitleBarStyle.hidden,
    backgroundColor: Colors.transparent,
    skipTaskbar: false,
    titleBarStyle: TitleBarStyle.hidden,
    skipTaskbar: true,
  );

  windowManager.waitUntilReadyToShow(windowOptions, () async {
    await windowManager.show();
    await windowManager.focus();
    // await windowManager.setAsFrameless(); // border
    // await windowManager.setHasShadow(true); // shadow
  });

  runApp(MyApp());
}

You may also need system_tray to make the Windows system tray.

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