Roll Tracker, for COR
This addon instantly displays your roll number, it’s effect, and whether the roll is lucky or not. (As opposed to the 5 second delay you find with the chatlog.
If you have rolled a lucky roll, it will also prompt you and automatically stop you from doubling up on it (which can be bypassed by either doubling up again, or typing //rolltracker autostop
The latest source and information for this addon can be found on GitHub.