Linux for PlayStation 2 (or PS2 Linux) is a kit released by Sony Computer Entertainment in 2002 that allows the PlayStation 2 console to be used as a personal computer. It included a Linux-based operating system, a USB keyboard and mouse, a VGA adapter, a PS2 network adaptor (Ethernet only), and a 40 GB hard disk drive (HDD). An 8 MB memory card is required; it must be formatted during installation, erasing all data previously saved on it, though afterwards the remaining space may be used for savegames. It is strongly recommended that a user of Linux for PlayStation 2 have some basic knowledge of Linux before installing and using it, due to the command-line interface for installation.
The official site for the project was closed at the end of October 2009 and communities like ps2dev are no longer active. There is still a small group of enthusiasts that meets on irc.freenode.net in channel sps2.
Read more about Linux For PlayStation 2: Capabilities, Open-source Applications, Distribution, Model Compatibility