From Select Development Solutions:
PHP Auto Dealer will allow you to setup an automated online showroom of your vehicle inventory that is easily maintainable from any Web browser via the admin interface with no coding or FTP required.
Features include unlimited custom fields, support for multiple vehicle types, multiple image support, automatic thumb creation and image resizing, easy administration, specials, search, sort, automatically write sold on images, private label/branding, Support for AutoTrader.com's datafeed, Cars.com datafeed, CarFax, Google Analytics, Refer a Friend, Ask Sales, Payment calculator, Automatic FTP to manage your listings on Auotrader.com and Cars.com with a simple click of a button, and more. Easily customized for automobiles, motorcycles, RVs, boats, or anything with a make model and year. Version 2.7 adds support for Cars.com, Automatic FTP for Autotrader.com and Cars.com.