Quice MaNGOS and Trinity Database Editor
You can edit Quests, Creatures, GameObjects, Items, Loot, Events, EventAI, SmartAI, And some minor things. 
http://quice.indomit.ru/
Truice is a database editor specifically for Trinity, Tools by Ishigure.
http://www.trinitycore.org/f/topic/180-bin-truice-win32/