Hackr.io is a website to search for programming-tutorials available online. All the tutorials are from other websites and are submitted to Hackr.io by its users. Once approved, the tutorials are published on the website with appropriate categorization. Users have the option to upvote tutorials and help other users choose.
Hackr.io is made on Laravel framework. Therefore, it's backend is based on PHP and front-end is based on HTML and CSS.