CPS2Shock - They make the decryption tables need to play the ROMs in CPS2 emulators. In this page you'll also find abundant information about the CPS2 hardware and complete listings of games using this hardware.
Final Burn - Page of the first CPS2 emulator. Now the project has been cancelled.
Kawaks - Another good Neogeo, CPS2, CPS1 emulator.
Calice32 - Another CPS2 emulator. It emulates CPS1 games too.