"At CloudFlare, we believe that open source, community-driven projects like CDNJS are the tools upon which the future of the internet will be built. CloudFlare is proud to provide the global CDN infrastructure that will help power that future."
cdnjs hosts any version of any library. Noticeably faster than Google CDN, as <a href="http://theindustry.cc/2012/07/10/cdnjs-and-cloudflare-more-than-just-a-cdn/" target="blank">noted by many users of the service</a>, it is a service which is run by <a href="https://www.cloudflare.com/" target="blank">CloudFlare</a> under the CloudFlare network.
Need to use a third party CDN? Think twice before using Google.