Sonys second console that competed with the Xbox and GameCube.
The first PlayStation 2 emulator that slowly showed us that PS2 emulation was possible. Updated frequently PCSX2 has a wide range of compatible games that is consistantly growing. Probably the best PS2 emulator currently available.
You will need a BIOS file for this emulator to work. Not updated as frequently as PCSX2 but still a decent emulator.