App:ZOTag
From CloudModding OoT Wiki
ZOTag is a program written in python by spinout that appends zelda resource files - such as objects or maps - together. It helped him with his restoration of object_human.
Usage:
python zot.py <file to append to> <file to append> <bank>
Example:
python zot.py /home/user/object1.zobj /home/user/object2.zobj 6
You can download it here