Download the Advanced Script[drive.google.com]
This Powershell script enables you to unpack mods, assets or any other .pak-files anywhere, or even whole folders of them. It should be self-explanatory, simply run it and follow the instructions.

Download the Script[drive.google.com]
This PowerShell script will unpack all steam workshop mods for Starbound and put them into a folder "Unpacked Mods" in the directory it was launched from.

If you open any of the scripts with a text editor, there are two parameters at the top that can be modified:
$nicenames if set to true(default), every folder will be renamed according to the mod name. If it's false, the names will be the mod id, which is the name of the folder which originally contained the mod.
$unpackdir the folder wherein the script will extract the files to

Feel free to write a comment or contact me should there be any issues or further questions!
Leaving a positive rating would motivate me to further improve the scripts and create new content for Starbound ;)

Changelog:
2017-10-19: Fixed bugs, Added Advanced Script