Elementarist

7.0.3 compatible

Addon that tries to optimize DPS output for level 100 elemental and enhancement shamans. It advise what spell you should cast next.
Also shows dps on the selected target (not the total dps) and aggro percentage.

Rules how it advises spells

• Based on the rotations as published in SimulationCraft

Also it display missing buffs:

• Lightning Shield
• Searing Totem
• Elemental Mastery
• Racial buffs

Display hint for casting

• Wind Shear if target casts a non instant or channeled spell, or threat is higher than 80%
• Purge if target has a purgeable buff
• Chain Lightning, Earthquake if multiple targets are detected

YouTube video (a bit old)