There are other emulators and other websites, like coolrom.com. I found PCSXR a good emulator for PS1 games, Dolphin works great for GameCube images and SixtyForce for N64. I got the PS2 emulator once but found it pretty complicated to set up, you had to install a Sony PS2 boot image of your own, then set up various things. For my use of PS2 games it wasn't worth the trouble.