any addon that shows party members GCD

hello all. I did try to search the forums and couldn't find anything that does this.

does anyone have any thoughts on if this is possible/has been done?

since the characters i need it for will both be in my control, its fine if it needs support at both ends.

I know I can see the cast bar. that doesn't help me as much as seeing the GCD, since I mainly just dot dot while running about looting.