My newest mod for Minecraft Forge, In-Game NBTEdit, allows users to create and edit NBT Tags in-game.
Topic: http://www.minecraftforum.net/topic/1...
In this video I give examples on how to:
-Make mobs invulnerable
-Make mobs wear armor/hold items
-Edit Player Heads
-Edit Spawners (& add custom data)
-Copy Chests