I don't know if any good ones are avaliable for free, but I just made the script on my arcade, and apart from the occasional bug when I am adding a new feature, it works fine, and was quite easy to make.
I have a very good and very powerful arcade script it's pretty easy to use and has many features such as rating and such. And even has games already included in the script would you be intrested in seeing a demo. Or you can have the script for just 5$
I have used GameScript.net which cost money and avscripts.net which is free and I love the free one a lot more you should just test the demo out for like a day or two. It's so easy to add links to your site using it and really easy to add games.