NBTExplorer
Edit low-level graphical NBT data present in the game Minecraft and several other applications. Open and modify the content of schematic files, standard NBT, uncompressed NBT, MCR, and MCA along with Cubic Chucks region files. Generate entirely new Minecraft regions of change the shapes and structures in existing ones.
NBTExplorer 2.0.3 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The most popular version of the program is 2.0. The actual developer of this free Mac application is Justin Aquadro.
The latest version of NBTExplorer can be installed on Mac OS X 10.6 or later. The software lies within Games, more precisely Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
NBTExplorer is a low-level graphical NBT data editor originally based on NBTedit. The key difference is NBTExplorer's full support for Minecraft .mcr/.mca region files, a directory-tree interface for easily exploring multiple worlds, and support for the latest NBT standard.
You may want to check out more software for Mac, such as Generator, ExaChess Lite or CubeTwister, which might be similar to NBTExplorer.
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