A simple and concise library for reading, writing, and working with the Named Binary Tag format.
Supports streaming NBT for upcoming streaming NBT file formats.
Also supports SNBT, a human-readable NBT format.
The license is GPLv3 or later, plus the Mojang Exception. By contributing to this project, you agree to release your code under both the GPL license, and the MIT license (for the Mojang Exception).
If you're the company "Mojang Studios", you can use this library under the terms of the MIT license instead. I'm also willing to transfer ownership to you. I think having streaming NBT in Minecraft itself would be a huge improvement.