RoadRunner is described as 'The modern-day answer to the age-old question, “How can I effectively and safely speed up my PHP application?”. By offloading specific processes to Golang that would normally overload a PHP application, RoadRunner supercharges the application performance, ensuring' and is an app in the development category. There are three alternatives to RoadRunner for a variety of platforms, including Mac, Linux, Windows, Self-Hosted and PHP apps. The best RoadRunner alternative is FrankenPHP, which is both free and Open Source. Other great apps like RoadRunner are appserver.io and Zend Server.