a microkernel based network distributed operating system

The NGC/Wii port seems to be the most barebones port of them all.

https://github.com/rickgaiser/bricks-os

https://code.google.com/archive/p/bricks-os/

https://web.archive.org/web/20090222060403/http://bricks-os.org/

Whether these emulators support operating systems for these consoles is unknown; it must be looked into further. Consoles without meaningful OSes are not included.

https://www.zophar.net/consoles/gamecube.html

https://www.gc-forever.com/forums/viewtopic.php?t=3943 (retroarch; not good)

https://emulation.gametechwiki.com/index.php/Emulators_on_GameCube

Atari 2600 – StellaGC

Coleco ColecoVision - CollisionGC

NEC TurboGrafx-16 – Hugo GX

Nintendo 64 – Cube64, Not64

Nintendo Entertainment System – FCE Ultra GX

Super Nintendo Entertainment System – SNES9xGC, Snes9xGX 1.51

Nintendo Game Boy (Color) – GBQ, Gnuboy GX

Nintendo Game Boy Advance – VisualBoy Advance GX, emGBA

Nintendo Pokémon Mini – Pokémon Channel emulator

https://www.gc-forever.com/wiki/index.php?title=Enhanced_mGBA

Sega Genesis – Genesis Plus GX, GCN GenesisPlus!

Sega Master System – SMS Plus GX

Sony PlayStation 1 – CubeSX, PCSX Revolution

A specific variant of the GC-Linux works.

https://www.youtube.com/watch?v=dsi-Uqvo65I

https://www.youtube.com/watch?v=KbC_0sNm6J0

This is GNU/Linux on the Nintendo GameCube

The general hub for everything Linux on GameCube, with many options available for install. Most of the below is likely available in the Sourceforge.

http://www.gc-linux.org/wiki/Main_Page

https://sourceforge.net/projects/gc-linux/

http://www.gc-forever.com/forums/viewforum.php?f=27

https://www.pierov.org/2020/12/19/finally-i-booted-gc-linux/

full features that a modchip would provide, without the need for one

A sort of hybrid between a loader app and operating system/BIOS. Could do some tweaks.

https://www.gc-forever.com/forums/viewtopic.php?t=4

Yet another variant of the GC-Linux works, with at least some info and instruction.

https://forums.gentoo.org/viewtopic-t-204804-start-0.html

Apparently a distro just to get Mplayer running on the GameCube?

https://sourceforge.net/projects/gc-linux/files/mplayer%20front-end%20distribution/

Whether these emulators support operating systems for these computers is unknown; it must be looked into further. PCs without meaningful OSes are not included.

CHIP-8 – CHIP-8 emulator

https://www.zophar.net/consoles/gamecube/chip8/chip-8-emulator.html

Nothing much to see here.

https://www.youtube.com/watch?v=Tve6ZBZaDsI

Swiss aims to be an all-in-one homebrew utility for the Nintendo GameCube.

The best and most modern GameCube homebrew browser/utility/EOP thing. It can browse many devices, and it’s still being updated in the modern day. Appears to supersede GCOS in some ways.

https://github.com/emukidid/swiss-gc

were porting or already ported the EGBrowser from the PlayStation 2 to the GameCube

Only has some traces on demo disks, but it was clearly an idea at some point. Leaked builds maybe?

https://www.deviantart.com/connorrentz/journal/The-GameCube-s-Lost-Internet-Browser-Discovered-799654842

I actually modified the configuration files within the disc to achieve this

Same stuff as the PS2 demo disc and Switch web browser method, just even more outdated.

https://www.gc-forever.com/forums/viewtopic.php?t=3316