We have already mentioned on how to access shutdown, restart, sleep and other power options in Windows 8 and also mentioned how to add these as shortcuts to start screen. NPowerTray is a new freeware and portable app which adds these power options like shutdown, restart, hibernate, sleep, log off etc to the system tray in Windows 8. This means that you can easily access them when working from the desktop as system tray is unchanged from Windows 7.
Since the app is portable, no installation required, just run the app and it sits in the system tray and you can access these functions from here.
Apart from this, the app also has special options like Force Shutdown, Force Reboot, Force Hibernate, Force Sleep, Force Log Off etc.
NPowerTray works well with Windows 8 as well as previous versions (both 32 bit and 64 bit).