Arena and Lucas chess are good. I like Lucas for it's simplicity though. And it is fun for my kid to play with. It comes with a tutor option also. http://lucas

Arena and Lucas chess are good. I like Lucas for it's simplicity though. And it is fun for my kid to play with. It comes with a tutor option also. http://lucaschess.pusku.com/ http://lucaschess.pusku.com/ http://www.playwitharena.com/?Download http://www.playwitharena.com/?Download Edit: Not sure if all of these are Open source though. But they are free.