From the PCSX2 Google Code page:
PCSX2 is an open source Playstation 2 emulator.
The PCSX2 project has been running for more than ten years. Once able to run only a few public domain demos, recent versions enable many games to work at full speed, including popular titles such as Final Fantasy X or Devil May Cry 3.
PCSX2 1.2.1 for Mac OS X using PCSX2-CE (beta): Download
Windows Latest Builds: http://pcsx2.net/download/development/svn.html
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