A free app for Android, by Tom Bayley.

The ideal method to customize your status bar is with Super Status Bar, which adds practical additions like gestures, notification previews, and rapid brightness and volume control. This app includes a variety of features, including brightness control, music/media, ring, notification, voice call, and alarm volume. It also has features that can automatically detect the type of sound playing and lets you customize notifications to your liking. There are simple gestures in the status bar to do custom actions, including tap, double tap, long press, and swipe left/right. In addition, the app can display your current battery level as a small bar. Finally, it is possible to add more features in the future.