cdnjs is a free distributed JS library delivery service.
Elfsight is an all-in-one platform offering 70+ customisable widgets for websites.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Silverstripe CMS is a free and open source Content Management System and Framework for creating and maintaining websites and web applications.
Tiny Slider is a vanilla javascript slider for all purposes.