diff --git a/files/home/.bash_profile b/files/home/.bash_profile
index bdcaeef..13f4ff7 100644
--- a/files/home/.bash_profile
+++ b/files/home/.bash_profile
@@ -1,6 +1,6 @@
 # Load .profile, containing login, non-bash related initializations.
 [ -f "$HOME/.profile" ] && source "$HOME/.profile"
 
-export NVM_DIR="$HOME/.nvm"
+export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
 [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
 [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
diff --git a/files/home/.zshrc b/files/home/.zshrc
new file mode 100644
index 0000000..e69de29
diff --git a/script/_utils.sh b/script/_utils.sh
index 3bb73f1..4ec0b31 100755
--- a/script/_utils.sh
+++ b/script/_utils.sh
@@ -31,10 +31,6 @@ function apt_installed {
     dpkg --status $1 >/dev/null
 }
 
-function clean {
-    sudo apt-get clean -qq
-}
-
 function update {
     sudo apt-get update -qq
 }
diff --git a/script/install.d/00-os_info.sh b/script/install.d/00-os_info.sh
index 57719f3..4e48e76 100755
--- a/script/install.d/00-os_info.sh
+++ b/script/install.d/00-os_info.sh
@@ -9,4 +9,6 @@ if [[ "$OSTYPE" == "darwin"* ]]; then
     sw_vers
 elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
     lsb_release -a
+else
+    echo "Unknown OS: $OSTYPE"
 fi
diff --git a/script/install.d/02-brew.sh b/script/install.d/02-brew.sh
new file mode 100755
index 0000000..935a74a
--- /dev/null
+++ b/script/install.d/02-brew.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   (macOS only) Install homebrew.
+#
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    export NONINTERACTIVE=1
+    if ! bin_in_path brew; then
+        download_run https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh /bin/bash
+    else
+        brew update
+    fi
+
+    brew --version
+
+    unset NONINTERACTIVE
+fi
diff --git a/script/install.d/02-zsh.sh b/script/install.d/02-zsh.sh
deleted file mode 100755
index c94e36a..0000000
--- a/script/install.d/02-zsh.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-
-# -----------------------------------------------------------------------------
-# Description:
-#   Install zsh shell.
-
-
diff --git a/script/install.d/03-nerdfont.sh b/script/install.d/03-nerdfont.sh
new file mode 100755
index 0000000..a7508a3
--- /dev/null
+++ b/script/install.d/03-nerdfont.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   (macOS only) Install nerdfonts.
+#
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    fonts_list=(
+        font-fira-mono-nerd-font
+        font-fira-code-nerd-font
+    )
+
+    brew tap homebrew/cask-fonts
+    for font in "${fonts_list[@]}"; do
+        brew install --cask "$font"
+    done
+
+    unset fonts_list
+fi
diff --git a/script/install.d/04-zsh.sh b/script/install.d/04-zsh.sh
new file mode 100755
index 0000000..a8e41be
--- /dev/null
+++ b/script/install.d/04-zsh.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   Configure zsh shell.
+#
+
+if ! bin_in_path zsh; then
+    if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+        install zsh
+    fi
+fi
+
+zsh --version
diff --git a/script/install.d/10-pyenv.sh b/script/install.d/10-pyenv.sh
index f1afff3..a457cc1 100755
--- a/script/install.d/10-pyenv.sh
+++ b/script/install.d/10-pyenv.sh
@@ -1,20 +1,35 @@
 #!/usr/bin/env bash
-if ! bin_in_path "pyenv"; then
-    # see https://github.com/pyenv/pyenv/wiki/common-build-problems
-    pyenv_list_file="$INSTALL_DIR/10-pyenv-pkglist"
-    install_file "$pyenv_list_file"
 
-    # see https://github.com/pyenv/pyenv-installer
-    download_run \
-        "https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer" \
-        bash
+# -----------------------------------------------------------------------------
+# Description:
+#   Configure pyenv.
+#
+
+if ! bin_in_path "pyenv"; then
+    if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+        # see https://github.com/pyenv/pyenv/wiki/common-build-problems
+        pyenv_list_file="$INSTALL_DIR/10-pyenv-pkglist"
+        install_file "$pyenv_list_file"
+
+        # see https://github.com/pyenv/pyenv-installer
+        download_run \
+            "https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer" \
+            bash
+e
+        unset pyenv_list_file
+    elif [[ "$OSTYPE" == "darwin"* ]]; then
+        brew install pyenv
+        brew install pyenv-virtualenv
+    fi
 fi
 
-virtualenv_path="$(pyenv root)/plugins/pyenv-virtualenv"
-if [ ! -d "$virtualenv_path" ]; then
-    git clone \
-        https://github.com/pyenv/pyenv-virtualenv.git \
-        $virtualenv_path
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    virtualenv_path="$(pyenv root)/plugins/pyenv-virtualenv"
+    if [ ! -d "$virtualenv_path" ]; then
+        git clone \
+            https://github.com/pyenv/pyenv-virtualenv.git \
+            $virtualenv_path
+    fi
 fi
 
 eval "$(pyenv init --path)"
diff --git a/script/install.d/11-python.sh b/script/install.d/11-python.sh
index 270c669..f10e650 100755
--- a/script/install.d/11-python.sh
+++ b/script/install.d/11-python.sh
@@ -1,4 +1,10 @@
 #!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   Configure Python.
+#
+
 export PYTHON_KEYRING_BACKEND=keyring.backends.null.Keyring
 
 if ! bin_in_path "pip3"; then
diff --git a/script/install.d/12-node.sh b/script/install.d/12-node.sh
index d3cff76..0286127 100755
--- a/script/install.d/12-node.sh
+++ b/script/install.d/12-node.sh
@@ -1,22 +1,33 @@
 #!/usr/bin/env bash
-nvm_version="v0.38.0"
+
+# -----------------------------------------------------------------------------
+# Description:
+#   Configure Node.js.
+#
+
+nvm_version="0.39.7"
 if ! bin_in_path "nvm"; then
-    download_run "https://raw.githubusercontent.com/nvm-sh/nvm/${nvm_version}/install.sh" \
+    download_run "https://raw.githubusercontent.com/nvm-sh/nvm/v${nvm_version}/install.sh" \
         "bash"
 fi
 
+NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
 [ -s "$NVM_DIR/nvm.sh" ] && source "$NVM_DIR/nvm.sh"
 
 nvm --version
-nvm alias default lts/fermium
-nvm install lts/fermium
-nvm use lts/fermium
+nvm alias default lts/iron
+nvm install lts/iron
+nvm use lts/iron
 
 node --version
 
 yarn --version
 
-for dep in $(jq -r ".node_dependencies[]" $CONFIG); do
-    yarn global add $dep
-    yarn global upgrade $dep
-done
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    for dep in $(jq -r ".node_dependencies[]" $CONFIG); do
+        yarn global add $dep
+        yarn global upgrade $dep
+    done
+fi
+
+unset nvm_version
diff --git a/script/install.d/20-docker.sh b/script/install.d/20-docker.sh
index 3d9ad2e..a068a4d 100755
--- a/script/install.d/20-docker.sh
+++ b/script/install.d/20-docker.sh
@@ -1,13 +1,23 @@
 #!/usr/bin/env bash
-docker --version
 
-readonly docker_group="docker"
-if ! grep -q "$docker_group" /etc/group; then
-    echo "Adding docker group"
-    sudo groupadd "$docker_group"
-fi
+# -----------------------------------------------------------------------------
+# Description:
+#   (Ubuntu only) Configure docker.
+#
 
-if ! groups "$USER" | grep -q "\b$docker_group\b"; then
-    echo "Adding user to docker group"
-    sudo usermod -aG docker "$USER"
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    docker --version
+
+    readonly docker_group="docker"
+    if ! grep -q "$docker_group" /etc/group; then
+        echo "Adding docker group"
+        sudo groupadd "$docker_group"
+    fi
+
+    if ! groups "$USER" | grep -q "\b$docker_group\b"; then
+        echo "Adding user to docker group"
+        sudo usermod -aG docker "$USER"
+    fi
+
+    unset docker_group
 fi
diff --git a/script/install.d/98-apt-clean.sh b/script/install.d/98-apt-clean.sh
deleted file mode 100755
index 00c4492..0000000
--- a/script/install.d/98-apt-clean.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/usr/bin/env bash
-clean
diff --git a/script/install.d/98-clean.sh b/script/install.d/98-clean.sh
new file mode 100755
index 0000000..28f501a
--- /dev/null
+++ b/script/install.d/98-clean.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   Clean up after installation.
+#
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    brew cleanup
+elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    sudo apt-get autoremove -qq
+    sudo apt-get clean -qq
+fi
\ No newline at end of file
diff --git a/script/install.d/99-screenfetch.sh b/script/install.d/99-screenfetch.sh
index 7563217..180fa04 100755
--- a/script/install.d/99-screenfetch.sh
+++ b/script/install.d/99-screenfetch.sh
@@ -1,2 +1,8 @@
 #!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   Print system information.
+#
+
 screenfetch