There are several programs which I use. One of these is (as mentioned above) Gamespy. But there are many varitations to Gamespy. For instance, Gamespy Arcade, and the standard Gamespy 3d are the most common. You can download Gamespy 3d trial off their site:
http://www.gamespy3d.com/

As for Gamespy Arcade, I believe that comes with both the demo, and the full version. Great program to use, very user friendly.

Another program, minus the eye-candy, is called The All-Seeing Eye. This one is great because it allows you to filter out many different versions of the game. Personally, it's the one I use when not using the in-game browser(which is not available with the demo.)

You can find the All Seeing Eye here:
http://www.udpsoft.com/eye/doc.html

And I'm pretty sure it can be used with the demo.