As others have mentioned your question doesn’t cleanly map to what a “cdn” really is these days. The minimal requirements for even the most basic content distri

As others have mentioned your question doesn’t cleanly map to what a “cdn” really is these days. The minimal requirements for even the most basic content distribution cache or NS setup is pretty significant in time and capex. In my experience as much effort goes in to operations and “control plane” management as the “dataplane” software that serves requests. What I haven’t seen others mention, and is a literal open source CDN, Is Coral CDN. I’m not sure if it’s a going concern anymore, but it was a plausibly useful academic project circa 2005-15. I believe to ubiquity and accessibility of very cheap commercial offerings, and the ratcheting improvements in commercial CDN tech, really put Coral “out of business” by 2013 or so. http://dsrg.pdos.csail.mit.edu/2013/07/18/coralcdn/ http://dsrg.pdos.csail.mit.edu/2013/07/18/coralcdn/ Disclosure: principal at AWS, used to work on CloudFront and Route 53. Opinions are my own and do not reflect my employer or any proprietary information.