Heres our Gamecube Homebrew page:

All in One Emuloader
ASCII Fighter
Automatii
BMPtoZlibGC
BricksOS
CubeDoom
Demotev
GameCube pong
GC Forth
GC FTP
GC Linux
GCMM
Gcos
Geckoloader
GL2GX
Libogc
Massager
Memory Card Backup
Mines
Nitrorally
OpenTyrianGC
Piero's Wiicross
Quake Gamecube
Scogger
Scrolling
SD Boot
SDL Sopwith
SL Jpeg Viewer
Speed Pong 4p
Supertux
Szigoy
Tetris
Terraringma demo
VTE
Wolfenstein 3D
XRickGC
Yeti 3D