The Heralds of Valdemar:
Arrows of the Queen
Arrow's Flight
Arrow's Fall
The Mage Winds Trilogy:
Winds of Change
Winds of Fate
Winds of Fury
The Mage Storms Trilogy:
Storm Warning
Storm Rising
Storm Breaking
I have not actually read the following, but they are a part of the saga:
The Last Herald Mage:
Magic's Pawn
Magic's Promise
Magic's Price