diff --git a/Aliases/gz-gui9 b/Aliases/gz-gui9
deleted file mode 120000
index 26841f5e0..000000000
--- a/Aliases/gz-gui9
+++ /dev/null
@@ -1 +0,0 @@
-../Formula/gz-gui8.rb
\ No newline at end of file
diff --git a/Formula/gz-gui9.rb b/Formula/gz-gui9.rb
new file mode 100644
index 000000000..df36a1187
--- /dev/null
+++ b/Formula/gz-gui9.rb
@@ -0,0 +1,119 @@
+class GzGui9 < Formula
+  desc "Common libraries for robotics applications. GUI Library"
+  homepage "https://github.com/gazebosim/gz-gui"
+  url "https://github.com/gazebosim/gz-gui.git", branch: "main"
+  version "8.999.999-0-20231016"
+  license "Apache-2.0"
+
+  head "https://github.com/gazebosim/gz-gui.git", branch: "main"
+
+  depends_on "cmake" => [:build, :test]
+  depends_on "pkg-config" => [:build, :test]
+  depends_on "gz-cmake4"
+  depends_on "gz-common6"
+  depends_on "gz-msgs11"
+  depends_on "gz-plugin3"
+  depends_on "gz-rendering9"
+  depends_on "gz-transport14"
+  depends_on macos: :mojave # c++17
+  depends_on "protobuf"
+  depends_on "qt@5"
+  depends_on "tinyxml2"
+
+  def install
+    rpaths = [
+      rpath,
+      rpath(source: lib/"gz-gui-8/plugins", target: lib),
+    ]
+    cmake_args = std_cmake_args
+    cmake_args << "-DBUILD_TESTING=Off"
+    cmake_args << "-DCMAKE_INSTALL_RPATH=#{rpaths.join(";")}"
+
+    mkdir "build" do
+      system "cmake", "..", *cmake_args
+      system "make", "install"
+    end
+  end
+
+  test do
+    # test some plugins in subfolders
+    %w[CameraFps Publisher TopicViewer WorldStats].each do |plugin|
+      p = lib/"gz-gui-8/plugins/lib#{plugin}.dylib"
+      # Use gz-plugin --info command to check plugin linking
+      cmd = Formula["gz-plugin3"].opt_libexec/"gz/plugin3/gz-plugin"
+      args = ["--info", "--plugin"] << p
+      # print command and check return code
+      system cmd, *args
+      # check that library was loaded properly
+      _, stderr = system_command(cmd, args: args)
+      error_string = "Error while loading the library"
+      assert stderr.exclude?(error_string), error_string
+    end
+    # build against API
+    (testpath/"test.cpp").write <<-EOS
+    #include <iostream>
+
+    #ifndef Q_MOC_RUN
+      #include <gz/gui/qt.h>
+      #include <gz/gui/Application.hh>
+      #include <gz/gui/MainWindow.hh>
+    #endif
+
+    //////////////////////////////////////////////////
+    int main(int _argc, char **_argv)
+    {
+      std::cout << "Hello, GUI!" << std::endl;
+
+      // Increase verboosity so we see all messages
+      gz::common::Console::SetVerbosity(4);
+
+      // Create app
+      gz::gui::Application app(_argc, _argv);
+
+      // Load plugins / config
+      if (!app.LoadPlugin("Publisher"))
+      {
+        return 1;
+      }
+
+      // Customize main window
+      auto win = app.findChild<gz::gui::MainWindow *>()->QuickWindow();
+      win->setProperty("title", "Hello Window!");
+
+      // Run window
+      // app.exec();
+
+      std::cout << "After run" << std::endl;
+
+      return 0;
+    }
+    EOS
+    (testpath/"CMakeLists.txt").write <<-EOS
+      cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+      find_package(gz-gui9 QUIET REQUIRED)
+      add_executable(test_cmake test.cpp)
+      target_link_libraries(test_cmake gz-gui9::gz-gui9)
+    EOS
+    ENV.append_path "PKG_CONFIG_PATH", Formula["qt@5"].opt_lib/"pkgconfig"
+    system "pkg-config", "gz-gui9"
+    cflags   = `pkg-config --cflags gz-gui9`.split
+    ldflags  = `pkg-config --libs gz-gui9`.split
+    system ENV.cc, "test.cpp",
+                   *cflags,
+                   *ldflags,
+                   "-lc++",
+                   "-o", "test"
+    ENV["GZ_PARTITION"] = rand((1 << 32) - 1).to_s
+    system "./test"
+    # test building with cmake
+    ENV.append_path "CMAKE_PREFIX_PATH", Formula["qt@5"].opt_prefix
+    mkdir "build" do
+      system "cmake", ".."
+      system "make"
+      system "./test_cmake"
+    end
+    # check for Xcode frameworks in bottle
+    cmd_not_grep_xcode = "! grep -rnI 'Applications[/]Xcode' #{prefix}"
+    system cmd_not_grep_xcode
+  end
+end