There are 4 repositories under ps2dev topic.
An attempt at a homebrew port of id's Quake 2 for the PlayStation 2 Console.
Hello World using PS2SDK DevKit (For homebrew development purposes)
WIP disassembler capable of disassembling machine code of PlayStation 2's Emotion Engine CPU (TX79)
PlayStation 2 DevEnv for Docker - a toolchain host for the PlayStation 2 SDK