diff --git a/app_builder/examples/wx_demo/mix.exs b/app_builder/examples/wx_demo/mix.exs
index 1647f3dcd..7560b2bfa 100644
--- a/app_builder/examples/wx_demo/mix.exs
+++ b/app_builder/examples/wx_demo/mix.exs
@@ -46,7 +46,6 @@ defmodule WxDemo.MixProject do
               ]
             ]
           ],
-          event_handler: WxDemo.Window,
           macos: [
             build_dmg: macos_notarization != nil,
             notarization: macos_notarization
diff --git a/app_builder/lib/app_builder.ex b/app_builder/lib/app_builder.ex
index 4a246e618..77bdcac88 100644
--- a/app_builder/lib/app_builder.ex
+++ b/app_builder/lib/app_builder.ex
@@ -1,6 +1,6 @@
 defmodule AppBuilder do
   def bundle(release) do
-    options = validate_options(release.options[:app])
+    options = validate_options(release.options[:app] || [])
 
     case os() do
       :macos ->
@@ -19,25 +19,28 @@ defmodule AppBuilder do
   end
 
   def init do
+    {:ok, _} = Registry.register(AppBuilder.Registry, "app_event_subscribers", [])
+
     if input = System.get_env("APP_BUILDER_INPUT") do
-      __rpc__(self(), input)
+      __rpc__(input)
     end
   end
 
-  def __rpc__(event_handler) do
-    input = IO.read(:line) |> String.trim()
-    __rpc__(event_handler, input)
+  def __rpc__ do
+    IO.read(:line)
+    |> String.trim()
+    |> __rpc__()
   end
 
-  def __rpc__(event_handler, "open_app") do
-    send(event_handler, :open_app)
+  def __rpc__("open_app") do
+    dispatch(:open_app)
   end
 
-  def __rpc__(event_handler, "open_url:" <> url) do
-    send(event_handler, {:open_url, url})
+  def __rpc__("open_url:" <> url) do
+    dispatch({:open_url, url})
   end
 
-  def __rpc__(event_handler, "open_file:" <> path) do
+  def __rpc__("open_file:" <> path) do
     path =
       if os() == :windows do
         String.replace(path, "\\", "/")
@@ -45,7 +48,13 @@ defmodule AppBuilder do
         path
       end
 
-    send(event_handler, {:open_file, path})
+    dispatch({:open_file, path})
+  end
+
+  defp dispatch(message) do
+    Registry.dispatch(AppBuilder.Registry, "app_event_subscribers", fn entries ->
+      for {pid, _} <- entries, do: send(pid, message)
+    end)
   end
 
   defp validate_options(options) do
@@ -55,7 +64,6 @@ defmodule AppBuilder do
       all: [
         :name,
         :icon_path,
-        :event_handler,
         url_schemes: [],
         document_types: [],
         additional_paths: []
@@ -83,15 +91,20 @@ defmodule AppBuilder do
       windows: []
     }
 
-    options = validate_options(options, root_allowed_options, os)
-
-    Keyword.update!(options, :document_types, fn document_types ->
+    options
+    |> validate_options(root_allowed_options, os)
+    |> Keyword.put_new_lazy(:name, &default_name/0)
+    |> Keyword.update!(:document_types, fn document_types ->
       Enum.map(document_types, fn options ->
         validate_options(options, document_type_allowed_options, os)
       end)
     end)
   end
 
+  defp default_name do
+    Mix.Project.config()[:app] |> to_string |> Macro.camelize()
+  end
+
   defp validate_options(options, allowed, os) do
     {macos_options, options} = Keyword.pop(options, :macos, [])
     {windows_options, options} = Keyword.pop(options, :windows, [])
diff --git a/app_builder/lib/app_builder/application.ex b/app_builder/lib/app_builder/application.ex
new file mode 100644
index 000000000..ddcd0580a
--- /dev/null
+++ b/app_builder/lib/app_builder/application.ex
@@ -0,0 +1,13 @@
+defmodule AppBuilder.Application do
+  @moduledoc false
+
+  use Application
+
+  def start(_type, _args) do
+    children = [
+      {Registry, keys: :duplicate, name: AppBuilder.Registry}
+    ]
+
+    Supervisor.start_link(children, strategy: :one_for_one, name: AppBuilder.Supervisor)
+  end
+end
diff --git a/app_builder/lib/templates/macos/Launcher.swift.eex b/app_builder/lib/templates/macos/Launcher.swift.eex
index 97abc6d60..90cde8df6 100644
--- a/app_builder/lib/templates/macos/Launcher.swift.eex
+++ b/app_builder/lib/templates/macos/Launcher.swift.eex
@@ -1,13 +1,8 @@
 <%
 
-event_handler = @app_options |> Keyword.fetch!(:event_handler) |> inspect()
+additional_paths = Enum.map_join(@app_options[:additional_paths], ":", &"\\(resourcePath)/#{&1}")
 
-additional_paths =
-  ["rel/erts-#{@release.erts_version}/bin"] ++ @app_options[:additional_paths]
-  |> Enum.map_join(":", &"\\(resourcePath)/#{&1}")
-
-%>
-import Cocoa
+%>import Cocoa
 
 class AppDelegate: NSObject, NSApplicationDelegate {
     var releaseTask: Process!
@@ -45,7 +40,6 @@ class AppDelegate: NSObject, NSApplicationDelegate {
             }
         }
     }
-
 }
 
 func startRelease(_ input : String) -> Process {
@@ -78,7 +72,7 @@ func rpc(_ event: String) {
     let task = buildReleaseTask()
     task.standardInput = input
     input.fileHandleForWriting.write("\(event)\n".data(using: .utf8)!)
-    task.arguments = ["rpc", "AppBuilder.__rpc__(<%= event_handler %>)"]
+    task.arguments = ["rpc", "AppBuilder.__rpc__()"]
     try! task.run()
     task.waitUntilExit()
 
@@ -88,17 +82,17 @@ func rpc(_ event: String) {
 }
 
 func buildReleaseTask() -> Process {
-    let releaseScriptPath = Bundle.main.path(forResource: "rel/bin/<%= @release.name %>", ofType: "")!
+    let task = Process()
+    task.launchPath = Bundle.main.path(forResource: "rel/bin/<%= @release.name %>", ofType: "")!
+    task.environment = ProcessInfo.processInfo.environment
+
+<%= if additional_paths != "" do %>
     let resourcePath = Bundle.main.resourcePath ?? ""
     let additionalPaths = "<%= additional_paths %>"
+    let path = task.environment!["PATH"] ?? ""
+    task.environment!["PATH"] = "\(additionalPaths):\(path)"
+<% end %>
 
-    var environment = ProcessInfo.processInfo.environment
-    let path = environment["PATH"] ?? ""
-    environment["PATH"] = "\(additionalPaths):\(path)"
-
-    let task = Process()
-    task.environment = environment
-    task.launchPath = releaseScriptPath
     task.standardOutput = logFile
     task.standardError = logFile
     return task
diff --git a/app_builder/lib/templates/windows/Installer.nsi.eex b/app_builder/lib/templates/windows/Installer.nsi.eex
index 30375a471..956dd727a 100644
--- a/app_builder/lib/templates/windows/Installer.nsi.eex
+++ b/app_builder/lib/templates/windows/Installer.nsi.eex
@@ -7,6 +7,7 @@ app_name = Keyword.fetch!(@app_options, :name)
 ;General
 
 Name "<%= app_name %>"
+ManifestDPIAware true
 OutFile "<%= app_name %>Install.exe"
 Unicode True
 InstallDir "$LOCALAPPDATA\<%= app_name %>"
diff --git a/app_builder/lib/templates/windows/Launcher.vbs.eex b/app_builder/lib/templates/windows/Launcher.vbs.eex
index a11bb0def..0d61702fe 100644
--- a/app_builder/lib/templates/windows/Launcher.vbs.eex
+++ b/app_builder/lib/templates/windows/Launcher.vbs.eex
@@ -1,10 +1,9 @@
 <%
 
-event_handler = @app_options |> Keyword.fetch!(:event_handler) |> inspect()
-
 additional_paths =
-  ["rel/erts-#{@release.erts_version}/bin"] ++ @app_options[:additional_paths]
-  |> Enum.map(&("root & \"" <> String.replace(&1, "/", "\\") <> ";\" & "))
+  for path <- Keyword.fetch!(@app_options, :additional_paths), into: "" do
+    "root & \"" <> String.replace(path, "/", "\\") <> ";\" & "
+  end
 
 %>
 
@@ -19,10 +18,12 @@ End If
 
 Set shell = CreateObject("WScript.Shell")
 Set env = shell.Environment("Process")
+<%= if additional_paths != "" do %>
 env("PATH") = <%= additional_paths %>env("PATH")
+<% end %>
 
 ' try release rpc, if release is down, this will fail but that's ok.
-cmd = "echo " & input & " | """ & script & """ rpc ""AppBuilder.__rpc__(<%= event_handler %>)"""
+cmd = "echo " & input & " | """ & script & """ rpc ""AppBuilder.__rpc__()"""
 status = shell.Run("cmd /c " & cmd, 0, true)
 
 ' try release start, if release is up, this will fail but that's ok.
diff --git a/app_builder/mix.exs b/app_builder/mix.exs
index 4e6ab82b9..d00946313 100644
--- a/app_builder/mix.exs
+++ b/app_builder/mix.exs
@@ -20,6 +20,7 @@ defmodule AppBuilder.MixProject do
 
   def application do
     [
+      mod: {AppBuilder.Application, []},
       extra_applications: [:logger, :eex, :inets, :ssl, :crypto]
     ]
   end
diff --git a/mix.exs b/mix.exs
index 77cfa3f1b..9bf2b870c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -6,6 +6,7 @@ defmodule Livebook.MixProject do
   @description "Interactive and collaborative code notebooks - made with Phoenix LiveView"
 
   @app_elixir_version "1.13.4"
+  @app_rebar3_version "3.19.0"
 
   def project do
     [
@@ -160,8 +161,8 @@ defmodule Livebook.MixProject do
               ]
             ]
           ],
-          event_handler: LivebookApp,
           additional_paths: [
+            "rel/erts-#{:erlang.system_info(:version)}/bin",
             "rel/vendor/elixir/bin"
           ],
           macos: [
@@ -201,5 +202,7 @@ defmodule Livebook.MixProject do
     release
     |> Standalone.copy_otp()
     |> Standalone.copy_elixir(@app_elixir_version)
+    |> Standalone.copy_hex()
+    |> Standalone.copy_rebar3(@app_rebar3_version)
   end
 end
diff --git a/rel/app/env.bat.eex b/rel/app/env.bat.eex
index 3c77f48ee..77eeec0ff 100644
--- a/rel/app/env.bat.eex
+++ b/rel/app/env.bat.eex
@@ -1,5 +1,7 @@
 set RELEASE_NODE=livebook_app
 set RELEASE_MODE=interactive
+set MIX_ARCHIVES=!RELEASE_ROOT!\vendor\archives
+set MIX_REBAR3=!RELEASE_ROOT!\vendor\rebar3
 set LIVEBOOK_SHUTDOWN_ENABLED=true
 
 set cookie_path="!RELEASE_ROOT!\releases\COOKIE"
diff --git a/rel/app/env.sh.eex b/rel/app/env.sh.eex
index f60ad526e..b84bdf9bb 100644
--- a/rel/app/env.sh.eex
+++ b/rel/app/env.sh.eex
@@ -1,7 +1,9 @@
 export RELEASE_NODE=livebook_app
 export RELEASE_MODE=interactive
-export LIVEBOOK_SHUTDOWN_ENABLED=true
+export MIX_ARCHIVES="${RELEASE_ROOT}/vendor/archives"
+export MIX_REBAR3="${RELEASE_ROOT}/vendor/rebar3"
 export WX_MACOS_NON_GUI_APP=1
+export LIVEBOOK_SHUTDOWN_ENABLED=true
 
 cookie_path="${RELEASE_ROOT}/releases/COOKIE"
 if [ ! -f $cookie_path ]; then
diff --git a/rel/app/standalone.exs b/rel/app/standalone.exs
index e5373e742..a272d61f0 100644
--- a/rel/app/standalone.exs
+++ b/rel/app/standalone.exs
@@ -7,7 +7,9 @@ defmodule Standalone do
   """
   @spec copy_otp(Mix.Release.t()) :: Mix.Release.t()
   def copy_otp(release) do
-    {erts_source, otp_bin_dir, otp_lib_dir} = otp_dirs()
+    erts_source = Path.join(:code.root_dir(), "erts-#{release.erts_version}")
+    otp_bin_dir = Path.join(:code.root_dir(), "bin")
+    otp_lib_dir = :code.lib_dir()
 
     # 1. copy erts/bin
     release_erts_bin_dir = Path.join(release.path, "erts-#{release.erts_version}/bin")
@@ -39,6 +41,10 @@ defmodule Standalone do
     release_lib_dir = Path.join(release.path, "lib")
     cp_r!(otp_lib_dir, release_lib_dir)
 
+    for dir <- Path.wildcard("#{release_lib_dir}/*/doc/{xml,html,pdf}") do
+      File.rm_rf!(dir)
+    end
+
     # 3. copy boot files
     release_bin_dir = Path.join(release.path, "bin")
 
@@ -58,7 +64,7 @@ defmodule Standalone do
     download_elixir_at_destination(standalone_destination, elixir_version)
 
     filenames =
-      case os() do
+      case AppBuilder.os() do
         :macos ->
           ["elixir", "elixirc", "mix", "iex"]
 
@@ -83,12 +89,40 @@ defmodule Standalone do
     :zip.unzip(String.to_charlist(path), cwd: destination)
   end
 
-  defp otp_dirs do
-    version = :erlang.system_info(:version)
-    root_dir = :code.root_dir()
+  @doc """
+  Copies Hex into the release.
+  """
+  @spec copy_hex(Mix.Release.t()) :: Mix.Release.t()
+  def copy_hex(release) do
+    release_archives_dir = Path.join(release.path, "vendor/archives")
+    File.mkdir_p!(release_archives_dir)
 
-    {:filename.join(root_dir, 'erts-#{version}'), :filename.join(root_dir, 'bin'),
-     :code.lib_dir()}
+    hex_version = Keyword.fetch!(Application.spec(:hex), :vsn)
+    source_hex_path = Path.join(Mix.path_for(:archives), "hex-#{hex_version}")
+    release_hex_path = Path.join(release_archives_dir, "hex-#{hex_version}")
+    cp_r!(source_hex_path, release_hex_path)
+
+    release
+  end
+
+  @doc """
+  Copies Rebar3 into the release.
+  """
+  @spec copy_rebar3(Mix.Release.t(), version :: String.t()) :: Mix.Release.t()
+  def copy_rebar3(release, version) do
+    url = "https://github.com/erlang/rebar3/releases/download/#{version}/rebar3"
+    path = Path.join(System.tmp_dir!(), "rebar3_#{version}")
+
+    unless File.exists?(path) do
+      binary = fetch_body!(url)
+      File.write!(path, binary, [:binary])
+    end
+
+    destination = Path.join(release.path, "vendor/rebar3")
+    File.cp!(path, destination)
+    make_executable(destination)
+
+    release
   end
 
   defp fetch_body!(url) do
@@ -105,13 +139,6 @@ defmodule Standalone do
 
   defp make_executable(path), do: File.chmod!(path, 0o755)
 
-  defp os() do
-    case :os.type() do
-      {:unix, :darwin} -> :macos
-      {:win32, _} -> :windows
-    end
-  end
-
   defp cp_r!(source, destination) do
     File.cp_r!(source, destination, fn _, _ -> false end)
   end