Posted by Mikuro, all credit goes to him
It's basically everything you need if you're a GM
If I left something out or you'd like to see more added then please tell me
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GM Handbook:
All GM Commands + Info
All Item IDs (+ Display IDs)
All Spell IDs
All NPC IDs (+ Display IDs + Flag Help)
Skill IDs
All Object IDs (+ Display IDs)
All Recall Names (+ Worldport Co-Ords)
All Faction IDs
All Mount IDs
Race & Class DB Info
All NPC Emotes
List of 'Uber' or GM Only Spells
Some Playall IDs (Unfinished)
All Instance IDs
Cool Morph IDs
T6 Itemset IDs
Holiday/Event Item/Object/NPC IDs
Trainer Learn IDs (Spells sorted by Class)
Addons:
Ascent DB Editor
DBC File Converter
DCB Extractor
Ecko Tools 1.6
Item Creator
Color MOTD Creator
WoW Map Viewer
WoW Model Viewer
GM UI Addons (AntrixAdmin, AntrixTeleport, GMAddon)