UnpackPKG is forked from https://github.com/uyjulian/unpackpkg
UnpackPKA is forked from https://github.com/uyjulian/unpackpka
Both tools were released originally under the MIT license.  I am eternally grateful to Julian!

You may also be interested in Julian's ED8 pkg to GLB convertor: https://github.com/uyjulian/ed8pkg2glb