I've got a friend who owns a car dealership and wants a basic site that allows listings of cars on his lot but I said I would do the site for free and was wondering if anyone knew of a simple and free software would do the basics allow him to list cars?

There's OSCommerce which is obviously for online shopping and Open Realty that is for properties, but is there anything for just listing cars?

It doesn't have to be that sophisticated either - just listing cars with an admin panel so he can login and add/delete/edit listings.

Any help would be appreciated!