Playstation

The first Sony console which competed with the N64.

ePSXe

Considered one of the best PlayStation emulators, it was the first to run commercial games at a reliable level. What you will come to figure out however is that you require a PlayStation bios otherwise the emulator will not work.

SSSPSX

Also a good choice for PlayStation emulation, SSSPSX is a small freeware emulator that hasn't seen to many updates but still packs a decent punch.