There are many unofficial third party accessories available for the GameCube; some of the most popular are detailed below.

Action Replay

A cheat device made by Datel, which enables gamers to enter codes in order to cheat at games. A FreeLoader (see below) is also included with the software, which contains a boot disc with the codes and startup, and a dongle that connects into memory card slot B. The dongle can only be used for saving codes. The device also works on the Wii for Game Cube games.

Action Replay MAX

An Action Replay with a dongle that works not only to save codes, but also can be used as a 64 Mb card with 1019 blocks. As with the standard Action Replay device, it will work in the Wii for GameCube Games.

Advance Game Port

Datel's version of the Game Boy Player. The dongle connects to memory card slot B and is booted up with the included boot disc. Some models have code generators for built in cheat devices. The advantages of this device are that there is no need to remove the bottom plate and no tools are need for installation. However, there are reports of some problems with the audio and video framerate and the device is not 100% compatible with GBA games.

Controller Extension

An extension cable for the controller that allows the user to sit farther away from the GameCube.

FreeLoader

Made by Datel, this disc disables the regional lockout in the GameCube, allowing games from any region (PAL, NTSC, JNTSC and so on) to be played on a console from any region. Will also work on the Wii in Game Cube mode.

Innovation INNOV3102 Controller Adaptor

A matching unit that allows PlayStation and PS2 controllers to be used on the GameCube.

Hais GameCube Smart Joy

An adapter that allows the connection of PlayStation and PS2 controllers to be used on the GameCube.

MAX Drive

A device that consists of a dongle, USB cable and a PC software disc, which allows the user to upload game saves from a memory card to a PC to be stored there or sent over the Internet.

MAX Memory

A 128 Mb dongle by Datel that contains up to 2043 blocks of data - the largest memory card for the GameCube to date.

Powerboard

A USB keyboard by Datel with a GameCube matching unit that can be used with the online Phantasy Star games. It can also be used to edit or add codes to the Action Replay.

SD Media Launcher

Allows homebrew games to be played on the GameCube. The dongle connects into the memory card slot and contains a removable SD card that holds the games. Also has a boot disc for starting the unit up, a 1GB SD card, and a USB SD card adaptor for uploading games from the PC to the GameCube. It will also work on the Wii in Gamecube mode.