Aura seconds remaining and the name (or spell ID) of an aura to track can help you display a spell when there are X seconds remaining. Remember, this is only true if the aura is between 0 and X exclusive.
Visible with your Spellbook open. Manage your loadouts and even export them to share with friends! Lots of customization options for the overall look/feel of the tracking icons displayed on screen.
Aura seconds remaining 0 is a special condition that does exactly what it says. It will show your desired spell if a tracked aura is NOT present on your target. This is very helpful for openers, initial application, or if an aura gets dispelled.
Drag your rotation anywhere on screen that is comfortable for you! Orient/resize/fade the icons however you desire with a main rotation, a smaller AoE rotation, and a mouseover rotation available as toggleable options in the main menu.
Each spell you put on your rotation can be customized with an intuitive menu complete with tooltip descriptions.