Tutorials/Programs and editors/NBTExplorer

Overview
NBTExplorer is a low-level graphical NBT (Named Binary Tag) data editor for Minecraft. With a directory-tree interface for easily exploring multiple worlds, and support for the latest NBT standard, NBTExplorer is built on top of Substrate.

Usage
NBT tags control every world parameter, such as ender chest items, player's inventory, gamemode, whether the world is Hardcore or not and many other things. NBTEditor can be used to view and change data, with uses including:
 * Locate in-game structures
 * Add or change items, and adding enchantments
 * Access the world seed
 * Changing gamerules without usage of the /gamerule command
 * Applying custom formatting to world or server names.

Compatible Formats

 * Standard NBT files (e.g. level.dat)
 * Schematic files
 * Uncompressed NBT files (e.g. idcounts.dat)
 * Minecraft region files (*.mcr)
 * Minecraft anvil files (*.mca)
 * Cubic Chunks region files

Links

 * NBTEdit on Curse Forums
 * NBTExplorer on Github