A simple addon that uses the Blizzard "clock" animation to display the GCD. I don't have any buttons visible on my screen during combat so I created this addon. At first, I created a oUF plugin that you can find here, but I really didn't need any oUF functionality for what I wanted to do. So, I created this standalone version.
How To Use it
Simply install the addon into your WoW\Interface\AddOns\ directory. By default the GCD cooldown is shown in the center of your screen. If you want to move or resize it, you'll need to edit the ShowGCD.xml file.
<!-- Size of the image -->
<Size x="160" y="160" />
<!-- Location on the screen -->
<Offset x="0" y="-132" />
<!-- Size of the animation -->
<Size x="160" y="160"/>
There are two 'Size' tags, one for the size of the image and one for the size of the clock animation. There is also one 'Offset' tag that controls where on the screen the GCD will be displayed. Just adjust these values as you see fit.