ARCTool v0.4 5/2/18
Created by tpw_rules
Modified by jamchamb (ARC repacking)

ARCTool is a Python script that can extract the multitude of different formats found in .arc game files. It has support for Yaz0, U8, and RARC, which are all that I have found.
The inspiration for this tool came about when I wrote a RARC extractor and realized that all the files I wanted to extract were U8, but they still had the arc extension.
I have tested it on Mac OS X 10.5.8 with Python 2.5 and 2.6. It should work on other platforms (Windows and Linux) provided Python is properly installed.
I have confirmed Yaz0 and U8 support to be 100% working.
If you have any trouble with it, message me on IRC (nick is tpw_rules) or leave a note on the talk page.

usage: ARCTool.py [-h] [-e EXTRACT] [-p PACK] [-q] [-l] [-v]
                  inputfile [inputfile ...]

positional arguments:
  inputfile             input files

optional arguments:
  -h, --help            show this help message and exit
  -e EXTRACT, --extract EXTRACT
                        Extract and write output to FILE/DIR. If you are
                        extracting multiple archives, all of them will be put
                        in this dir.
  -p PACK, --pack PACK  Create ARC containing input files (given directory is
                        placed in root)
  -q, --quiet           don't print anything (except errors)
  -l, --list            print a list of files contained in the specified
                        archive (ignores -q)
  -v, --verbose

Requirements:
Python 2.5 or higher (not Python 3.x however). Get Python for your OS at http:https://python.org/download/

THANKS TO

#python on freenode for helping me with some stupid mistakes.
#wiidev for, again, helping me with stupid mistakes (and not so stupid ones).
YAGCD and the WiiBrew wiki for documentation and example code on the various formats.
Magicus for parse-u8.c which I used for testing.
Everybody else I forgot.