Pretty generic, so could be one of many.
If you simply want an addon to do timer bars, then maybe look at NeedToKnow.
Other more substantial options would include WeakAuras2, Raven or Gnosis.
These are just a few options though.
Originally Posted by DeadmanWalking
Your forgot to include the part where we blame casuals for everything because blizzard is catering to casuals when casuals got jack squat for new content the entire expansion, like new dungeons and scenarios.
Originally Posted by Reinaerd
T'is good to see there are still people valiantly putting the "Ass" in assumption.