PCSX2 Emulator is a PlayStation 2 Emulator developed and maintained by PCSX2 Team. It has open sources license as well as freeware application you don’t need to pay any money for this software’s.In its latest stable release, many PS2 games are playable, and several games have full functionality.
The current stable version is reported to be fully compatible with around 90% of the PS2 library. The main c in PS2 emulation is emulating the multi-processor PS2 on a PC 32-bit as well as 64-bit architecture.It is based core on a plug-in architecture, separating several functions from the core emulator.
Different plug-ins may produce different results in both compatibility and performance of the PCSX2 Emulator.It Support Linux Operating System Platform.

# add-apt-repository ppa:gregory-hainaut/PCSX2.official.ppa 
# apt-get update 
# apt-get install PCSX2 
$ PCSX2

Then need to configure the emulator
1.First time System Configuration
2.First time Plugin Configuration
3.First time Bios Selection
4.Setting of PS2 Controllers
and you are rwady to run your game.
(For running PS2 games you must have official PS2 games DVD and Obtaining PS2 games can be as easy as buying PS2 DVDs then make it .ISO images for smooth run of games.)

Sources and info:
www.thetechbrown.com
www.github.com