CDN
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services

JavaScript libraries
Build a standards compliant Style switcher After explaining the basics of alternate style sheets Sowden shows how to make them work in IE Mozilla and other modern browsers with just a few lines of JavaScript Use style switchers to make your site more accessible to facilitate user customization

Since 1983 developing the free Unix style operating system GNU so that computer users can have the freedom to share and improve the software they use