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Free Public CDN

Why Use a Public CDN?
Performance

Content delivery networks, in general, can reduce your page response times because they are able serve resources from multiple geographic locations, lowering the distance the data has to travel to reach the user. Compared to multipurpose web servers, like the ones used by shared web hosting providers, CDNs also have optimized backend technology specifically for sending out static page resources such as images, JS files, stylesheets, and so forth.
Ease of use and maintenance

It’s a hassle to upload and update open source libraries on your server. With free public CDNs, all you have to do is reference your dependencies and they will just work. And, if you were away on vacation or aren’t keeping up with project updates as much as you should, you have little to worry about because the public CDN will likely update the files they’re serving.

Reliability

The free public CDNs in this list are backed by major tech companies, giving you a bit of assurance with regards to their trustworthiness and service performance.
Higher cached probability

Because public CDNs are used by many websites, there’s a bigger chance that the user coming to your site already has a resource stored in their browser, further improving your page response times.
It’s free

In my definition of what a “public CDN” is, the service should have no fees and should be accessible by anyone, just like Gmail or Dropbox.

bytedance.com

Apr 19, 2022 |
ByteDance is the parent company of TikTok, and their businesses in Chinese mainland include Douyin and Toutiao. ByteDance Static Resource Public CDN is the only public CDN available in Chinese ... Read more

cdnjs.com

Apr 19, 2022 |
cdnjs is a free and open-source software CDN hosted by Cloudflare. As of May 2021, it serves 4,013 JavaScript and CSS libraries, which are stored publicly on GitHub. It is included in millions of ... Read more

Google Hosted Libraries

Apr 19, 2022 |
Google Hosted Libraries is Google put some very popular JavaScript frameworks or libraries on Google's servers, so that you can make full use of Google's server resources, save their own network ... Read more

jsDelivr - A free, fast, and reliable CDN for open source

Apr 19, 2022 |
Supports npm, GitHub, WordPress, Deno, and more. Largest network and best performance among all CDNs. Serving more than 80 billion requests per month. ... Read more

Microsoft Ajax Content Delivery Network

Apr 19, 2022 |
Many people outside of the ASP.NET development community don’t know that Microsoft has a public CDN. Among the open source projects on Microsoft’s Ajax CDN are jQuery, Bootstrap, and ... Read more