The PS2 toolchain scripts automatically build and install compilers and binutils that can be used to create homebrew software for the PS2 console.
Homebrew PS2 SDK
PS2 Ethernet drivers (incl. SMAP)
PS2-side boot loader
gsKit is a C interface to the PS2 Graphics Synthesizer
Create packed ELF files to run on the PS2
A public domain utility for working with PlayStation 2 memory card images. By Ross Ridge.
Desktop clients to interact with ps2link and ps2netfs
PS2 GDB stub
Ports of useful libraries to PS2SDK