ocAds (Open Classified Ads) is a PHP script to build your own classifieds site. It enables you to create classifieds sites in minutes, and comes with thousands of car, boat, motorcycle, ATV, RV, and trailer classifieds. It is fully customizable regarding listings and display, and features SEO friendly URLs, templates, and more.
osclass is Web-based software for creating classified ads. The ads can be general or specialized by category (such as cars, jobs, or real estate). It is easy to install on private/dedicated or shared hosting services. It has lots of options for customization. It is integrated with the TinyMCE WYSIWYG editor. It can be extended through modules (for vertical ads) or extensions (plugins). It supports multiple languages. The look and feel are can be changed with themes. It is SEO friendly. It has an integrated search engine with full text support. An unlimited number of categories and sub-categories can be defined. It has anti-spam facilities that are enabled out of the box (with CAPTCHAs and Askimet).