jsDelivr - A free, fast, and reliable Open Source CDN for npm and GitHub with the largest network and best performance from all OSS CDNs. Serving 100 billion requests per month.
CoralCDN - CoralCDN is a free and open content distribution network based around peer-to-peer technologies...
RawGit - RawGit serves raw files directly from GitHub with proper content-type headers.
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
raw.githack.com - raw.githack.com serves raw files from github.com with proper Content-Type headers (like rawgit.
Statically - The free optimization & CDN for images, CSS, JavaScript, and open source.