Warns when you cast an old spell rank, trains everything in one click, puts new ranks on your bars automatically, and shows what you can train at every level for all classes.
A Hunter toolkit for WoW: Forever: an ammo counter that keeps your quiver stocked, every spell one click away, pet and Aspect reminders, and a one-key healing potion.
A Warlock soulshard counter and spell launcher for WoW: Forever, with alerts for a missing self buffs or Healthstones and a warning when you cast a downranked spell.
The cheapest route to 300 in every crafting profession and Cooking on WoW: Forever, priced from your own auction house scan, with a shopping list that counts what's in your bags.
