XeNTaX

Been looking around for information on unpacking game cube ISO's but haven't found anything useful beyond "unpack the rar file, then burn it to a disc. Congratulations!"

Are there any standards for GC stuff or tools that I can try?
The file starts with the ID of the game, but I'm guessing most GC disks are like that.

The Dolphin emulator can view the file systems for Wii/GameCube games. Just set up a folder for the game(s), set that path up in Dolphin, and right-click the game you want to export files from and click "Properties". The "Filesystem" tab has the contents of the ISO, right-click a file and choose "Extract File", or "Extract All Files" if you want to unpack everything.

That's pretty convenient. No need for separate unpackers lol

VGMToolbox has an ISO extractor included. It can unpack GC/WII (with ckey.bin) as well.

It has plenty of formats included: "GameCube, Green Book (CD-i), ISO 9660 (PSX/PS2), NullDC GDI (Dreamcast), Opera FS (3DO), Wii Optical Disc, XDVDFS (XBOX/XBOX360)" at the time of this post.

Just open Misc. Tools > Extraction Tools > Generic > ISO Extractor

Oh, that's a lot of consoles. Looks like something nice to have around.