JSDelivr
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.
It is currently the 2nd most popular public CDN that hosts multiple projects.Overview
jsDelivr also has an API for developers, no traffic limits and is accessible worldwide, including from mainland China. The project is sponsored by multiple notable companies like Cloudflare, Fastly, Stackpath, Cedexis, NS1 and DigitalOcean. The most popular hosted project there is slick-carousel with 3.7 billion monthly requests.