diff --git a/src/Application.php b/src/Application.php
index d33251b8..c5b29c8a 100644
--- a/src/Application.php
+++ b/src/Application.php
@@ -27,19 +27,58 @@ class Application
         return static::getInstance();
     }
 
-    private $router = null;
-    private $templating = null;
-    private $configuration = null;
+    public static function gitCommitInfo(string $format): string
+    {
+        return trim(shell_exec(sprintf('git log --pretty="%s" -n1 HEAD"', $format)));
+    }
+
+    public static function gitCommitHash(bool $long = false): string
+    {
+        return self::gitCommitInfo($long ? '%H' : '%h');
+    }
+
+    public static function gitBranch(): string
+    {
+        return trim(shell_exec('git rev-parse --abbrev-ref HEAD'));
+    }
+
+    private $modules = [];
+
+    public function __get($name)
+    {
+        if (starts_with($name, 'has') && strlen($name) > 3 && ctype_upper($name[3])) {
+            $name = lcfirst(substr($name, 3));
+            return $this->hasModule($name);
+        }
+
+        if ($this->hasModule($name)) {
+            return $this->modules[$name];
+        }
+
+        throw new \Exception('Invalid property.');
+    }
 
     protected function __construct($config = null)
     {
         ExceptionHandler::register();
 
-        $this->router = new RouteCollection;
-        $this->templating = new TemplateEngine;
-        $this->configuration = new ConfigManager($config);
+        $this->addModule('router', new RouteCollection);
+        $this->addModule('templating', new TemplateEngine);
+        $this->addModule('config', new ConfigManager($config));
 
-        echo 'hello!';
+        $this->templating->addFilter('json_decode');
+        $this->templating->addFilter('byte_symbol');
+        $this->templating->addFunction('byte_symbol');
+        $this->templating->addFunction('session_id');
+        $this->templating->addFunction('config', [$this->config, 'get']);
+        $this->templating->addFunction('route', [$this->router, 'url']);
+
+        echo sprintf(
+            'Running on commit <a href="https://github.com/flashwave/misuzu/commit/%s">%s</a> on branch <a href="https://github.com/flashwave/misuzu/tree/%3$s">%3$s</a>!',
+            self::gitCommitHash(true),
+            self::gitCommitHash(),
+            self::gitBranch()
+        );
     }
 
     public function __destruct()
@@ -51,50 +90,22 @@ class Application
     {
         ExceptionHandler::debug($mode);
 
-        if ($this->hasTemplating()) {
-            $this->getTemplating()->debug($mode);
+        if ($this->hasTemplating) {
+            $this->templating->debug($mode);
         }
     }
 
-    public function hasRouter(): bool
+    public function addModule(string $name, $module): void
     {
-        return !is_null($this->router) && $this->router instanceof RouteCollection;
-    }
-
-    public function getRouter(): RouteCollection
-    {
-        if (!$this->hasRouter()) {
-            throw new \Exception('No RouteCollection instance is available.');
+        if ($this->hasModule($name)) {
+            throw new \Exception('This module has already been registered.');
         }
 
-        return $this->router;
+        $this->modules[$name] = $module;
     }
 
-    public function hasTemplating(): bool
+    public function hasModule(string $name): bool
     {
-        return !is_null($this->templating) && $this->templating instanceof TemplateEngine;
-    }
-
-    public function getTemplating(): TemplateEngine
-    {
-        if (!$this->hasTemplating()) {
-            throw new \Exception('No TemplateEngine instance is available.');
-        }
-
-        return $this->templating;
-    }
-
-    public function hasConfig(): bool
-    {
-        return !is_null($this->configuration) && $this->configuration instanceof ConfigManager;
-    }
-
-    public function getConfig(): ConfigManager
-    {
-        if (!$this->hasConfig()) {
-            throw new \Exception('No ConfigManager instance is available.');
-        }
-
-        return $this->configuration;
+        return array_key_exists($name, $this->modules) && !is_null($this->modules[$name]);
     }
 }
diff --git a/src/TemplateEngine.php b/src/TemplateEngine.php
index cbbd51b5..7300ec6c 100644
--- a/src/TemplateEngine.php
+++ b/src/TemplateEngine.php
@@ -13,23 +13,6 @@ use Twig_SimpleFunction;
  */
 class TemplateEngine
 {
-    /**
-     * Utility |filters().
-     */
-    private const UTILITY_FILTERS = [
-        'json_decode',
-        //'byte_symbol',
-    ];
-
-    /**
-     * Utility functions().
-     */
-    private const UTILITY_FUNCTIONS = [
-        //'route',
-        //'config',
-        //'session_id',
-    ];
-
     /**
      * Template file extension.
      */
@@ -61,14 +44,6 @@ class TemplateEngine
             'auto_reload' => false,
             'debug' => false,
         ]);
-
-        foreach (static::UTILITY_FILTERS as $filter) {
-            $this->addFilter($filter, $filter);
-        }
-
-        foreach (static::UTILITY_FUNCTIONS as $function) {
-            $this->addFunction($function, $function);
-        }
     }
 
     /**
@@ -147,11 +122,11 @@ class TemplateEngine
     private function fixPath(string $path): string
     {
         // if the .twig extension if already present just assume that the path is already correct
-        if (substr($path, 0 - strlen(static::FILE_EXTENSION)) === static::FILE_EXTENSION) {
+        if (ends_width($path, self::FILE_EXTENSION)) {
             return $path;
         }
 
-        return str_replace('.', '/', $path) . static::FILE_EXTENSION;
+        return str_replace('.', '/', $path) . self::FILE_EXTENSION;
     }
 
     /**
@@ -162,7 +137,7 @@ class TemplateEngine
      */
     public function render(string $path, array $vars = null): string
     {
-        $path = static::fixPath($path);
+        $path = self::fixPath($path);
 
         if ($vars !== null) {
             $this->vars($vars);
@@ -223,6 +198,6 @@ class TemplateEngine
      */
     public function exists(string $path, string $namespace): bool
     {
-        return $this->loader->exists('@' . $namespace . '/' . static::fixPath($path));
+        return $this->loader->exists('@' . $namespace . '/' . self::fixPath($path));
     }
 }
diff --git a/utility.php b/utility.php
index 26edfde4..2da54c04 100644
--- a/utility.php
+++ b/utility.php
@@ -35,6 +35,22 @@ function has_flag(int $flags, int $flag): bool
     return ($flags & $flag) > 0;
 }
 
+function byte_symbol($bytes, $decimal = false)
+{
+    if ($bytes < 1) {
+        return "0 B";
+    }
+
+    $divider = $decimal ? 1000 : 1024;
+    $symbols = ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'];
+
+    $exp = floor(log($bytes) / log($divider));
+    $bytes = $bytes / pow($divider, floor($exp));
+    $symbol = $symbols[$exp];
+
+    return sprintf("%.2f %s%sB", $bytes, $symbol, $symbol !== '' && !$decimal ? 'i' : '');
+}
+
 function is_int_ex($value, int $boundary_low, int $boundary_high): bool
 {
     return is_int($value) && $value >= $boundary_low && $value <= $boundary_high;
@@ -74,8 +90,3 @@ function is_int64($value): bool
 {
     return is_int_ex($value, -0x8000000000000000, 0x7FFFFFFFFFFFFFFF);
 }
-
-function is_uint64($value): bool
-{
-    return is_int_ex($value, 0x0, 0xFFFFFFFFFFFFFFFF);
-}