YARH is another rotation helper.
Other "rotation" WeakAuras don't really help you with an actual rotation. They just give you a bunch of icons that help you decide what you rotation should be. In effect, it only helps your eyes, not your brain.
But the thing is, rotations for most classes and specs are very easy to implement programmatically. YARH does exactly that. It shows you a SINGLE icon that tells you which button to press. You can forget about your energy, combo points, procs, debuffs! Just look at YARH icon and press buttons.
Right now it has rotations for Monk, Paladin, Druid, Demon Hunter and an Arms Warrior.
It also has framework to easily build rotation for any other class and spec, although you will need to know a little bit about programming. All code is contained in Actions -> Initialization.