Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Imperva is a cyber security software and services company for networking, data, and application security.
JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.