diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,11 @@
+# Changelog for `moffy-samples-gtk3`
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to the
+[Haskell Package Versioning Policy](https://pvp.haskell.org/).
+
+## Unreleased
+
+## 0.1.0.0 - YYYY-MM-DD
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright Yoshikuni Jujo (c) 2023
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Yoshikuni Jujo nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,1 @@
+# moffy-samples-gtk3
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/app/Main.hs b/app/Main.hs
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--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,24 @@
+{-# LANGUAGE ImportQualifiedPost #-}
+{-# LANGUAGE LambdaCase #-}
+{-# OPTIONS_GHC -Wall -fno-warn-tabs #-}
+
+module Main (main) where
+
+import System.Environment
+import Control.Moffy.Samples.Boxes
+import Control.Moffy.Samples.Boxes.Run.Gtk3
+import Control.Moffy.Samples.Followbox
+import Control.Moffy.Samples.FollowboxAnother qualified as A
+import Control.Moffy.Samples.FollowboxOrigin qualified as O
+import Control.Moffy.Samples.Followbox.Run.Gtk3
+
+main :: IO ()
+main = getArgs >>= \case
+	["boxes"] -> runBoxes boxes
+	["followbox"] -> runFollowbox "firefox" followbox
+	["followbox-another"] -> runFollowbox' "firefox" A.followbox
+	["followbox-origin"] -> runFollowbox "firefox" O.followbox
+	_ -> putStrLn $
+		"Usage: moffy_samples [SUBCOMMAND]\n\n" ++
+		"Commands are\n\tboxes\n" ++
+		"\tfollowbox\n\tfollowbox-another\n\tfollowbox-origin"
diff --git a/moffy-samples-gtk3.cabal b/moffy-samples-gtk3.cabal
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--- /dev/null
+++ b/moffy-samples-gtk3.cabal
@@ -0,0 +1,57 @@
+cabal-version: 2.2
+
+-- This file has been generated from package.yaml by hpack version 0.35.2.
+--
+-- see: https://github.com/sol/hpack
+
+name:           moffy-samples-gtk3
+version:        0.1.0.0
+synopsis:       Sample executables of moffy - GTK3 version
+description:    Please see the README on GitHub at <https://github.com/YoshikuniJujo/moffy-samples-gtk3#readme>
+category:       Control
+homepage:       https://github.com/YoshikuniJujo/moffy-samples-gtk3#readme
+bug-reports:    https://github.com/YoshikuniJujo/moffy-samples-gtk3/issues
+author:         Yoshikuni Jujo
+maintainer:     yoshikuni.jujo@gmail.com
+copyright:      Copyright (c) 2023 Yoshikuni Jujo
+license:        BSD-3-Clause
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    CHANGELOG.md
+
+source-repository head
+  type: git
+  location: https://github.com/YoshikuniJujo/moffy-samples-gtk3
+
+executable moffy_samples_gtk3
+  main-is: Main.hs
+  other-modules:
+      Paths_moffy_samples_gtk3
+  autogen-modules:
+      Paths_moffy_samples_gtk3
+  hs-source-dirs:
+      app
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , moffy-samples
+    , moffy-samples-gtk3-run
+  default-language: Haskell2010
+
+test-suite moffy-samples-gtk3-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_moffy_samples_gtk3
+  autogen-modules:
+      Paths_moffy_samples_gtk3
+  hs-source-dirs:
+      test
+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      base >=4.7 && <5
+    , moffy-samples
+    , moffy-samples-gtk3-run
+  default-language: Haskell2010
diff --git a/test/Spec.hs b/test/Spec.hs
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--- /dev/null
+++ b/test/Spec.hs
@@ -0,0 +1,2 @@
+main :: IO ()
+main = putStrLn "Test suite not yet implemented"