This free plugin from WordPress is really powerful for a free plugin. It helps building classified ad websites powered by WordPress.
After installation, the plugin creates 15 pages with the shortcodes of the classified ad plugin in it. Those pages are the ones that are necessary to run a classified ad website (post a listing, get the list of ad categories, list of locations, Manage posted listings, user account management…)
You can add categories and subcategories. The settings let you display the categories in a text or boxes fashion showing categories and subcategories or categories only.
“Locations are” a list of places (cities, states, countries) that you entered manually in WordPress. Locations are added to the ad listing form, the ad page, and the search form.
You can use Google ReCaptcha to prevent spams and google maps in the plugin. Note that the Google maps module is used for people to show their classified ad location on a map but there is no search by radius.
The plugin also features a custom fields module. For example, you can add a drop-down menu where the user chooses the brand of a car during ad posting. Additionally, this custom field is added to the search form so that people can search an ad by
You can add an addon to pay using the woocommerce ecommerce plugin.
The fee plan module helps you to prompt for a payment for posting to a given ad category.
To me it is the best classified ad plugin for WordPress.