This website uses a content management software (CMS) known as Drupal. Drupal is an open source software platform that anyone can download, use, work on, and share with others. It's built on principles like collaboration, globalism, and innovation. It's distributed under the terms of the GNU General Public License (GPL). There are no licensing fees, ever. Drupal will always be free.
That said, programmers spend a lot of time writing thousands of lines of code. It's not an easy or quick task. It requires analytical skills, design skills, constant troubleshooting, and, most importantly, collaboration. Experienced programmers, novice programmers--it doesn't matter who you are, we are always collaborating with each other.
That brings me to attribution. Attribution means to give other programmers credit for their work. If it's a website (like this one), you can give attribution in many ways. Some programmers put it in a comment tag that can be seen if you view the page source. I've chosen to create a page for mine. The W3CSS theme and the W3CSS paragraphs modules were created by lead Drupal developer, Alaa Haddad. To learn more about Drupal's contributors, click here.