Excida RealtyScript is a PHP based reality website content management system. It is the framework behing thousands of real estates website found on the web.
Excida RealtyScript was originally a paid script product. I no longer had time to support the business, so I've decided to convert it to a MIT licensed open source project. It is 100% open source. There are no "premium" or "paid" add-ons, etc.
If you are not an experienced developer, this script is very easy to setup and extend. It doesn't use and extra libraries. Its very easy to find the place that code needs to be modified in order to make the changes you need.
It is very well documented as well.