OpenClassify is modular and most advanced open source classified platform build with Laravel 8.1 & PHP 8.2 Supported. Included Pyrocms

CodeIgniter classified app

REBOOT - Noah Classifieds - This software was given to Yclas that qashed it. I have the source code and OG downloads. Yes it is an old project but it works! It works great on the newer hosting such as GoDaddy with solid state equipment.

This is platform for those that want to sell and buy property either land, houses, cars and for those that have lands, cars, houses and phones for sales. You can clone the repository but the database details are not included. It can serve as a guide for you to develop something similar using PHP and MySQL.