CMS similar to Yelp.com?

Does anyone know of a CMS that is free and would allow me to create a website with features similar to Yelp?

So far I have found Meeplace, but I don't have the money to buy it.

I have also found Wordpress themes, such as Geo Places by Templatic and City Guide by WooThemes, but I would rather not use Wordpress. I think it would work out better with another CMS that isn't intended for blogs.

Thanks