DarkMeter is an addon originally developed by justDax, find the original here: DarkMeter
DarkMeter has been abandoned by justDax and I have been given permission to continue on his work (he never managed to get this on Curse): Reddit Topic with permission
DarkMeter's main features over other meters are the style and the clear way it can show you where your damage comes from etc.
If you have any issues with seeing the window when installed make sure you type /dm restore first. That should fix it.
Short term improvements are going to be fixing fights that have been Bailed Out, allow column resizing, finish the Death Recap and adding some more stats like attacks per second.
Special thanks to Zod Bain for helping me fixing the report function.