NBT Studio has been discontinued. Similar games include Universal Minecraft Tool. It's paid, but NBTExplorer is free. Between them they cover Windows, Linux and Mac.
The Universal Minecraft Tool is a suite of Minecraft apps combined into a single program. Everything shares one codebase which results in quicker updates, maximum reliability, and better value for you.
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NBTExplorer is an open-source NBT editor for all common sources of NBT data. It's mainly intended for editing & viewing Minecraft game data.
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