Embedded code licenses:

SpongePowered Mixins is licensed under MIT, and is compatible with LGPLv3.
Full license notice here: https://github.com/SpongePowered/Mixin/blob/master/LICENSE.txt

MixinExtras is licensed under MIT, and is compatible with LGPLv3.
Full license notice here: https://github.com/LlamaLad7/MixinExtras/blob/master/LICENSE

MixinBooterLegacy is licensed under LGPLv2.1+, and is compatible with LGPLv3.
Full license notice here: https://github.com/tox1cozZ/mixin-booter-legacy/blob/master/LICENSE

SpongeMixins is licensed under MIT, and is compatible with LGPLv3.
Full license notice here: https://github.com/TimeConqueror/SpongeMixins/blob/master/LICENSE

Mixingasm is licensed under Unlicense, and is compatible with LGPLv3.
https://github.com/makamys/Mixingasm/blob/master/UNLICENSE