The public recursive name servers that are available for the public include AdGuard, CleanBrowsing, Cloudflare, and many more.
AdGuard CleanBrowsing Cloudflare Comodo Dyn Google Neustar OpenDNS OpenNIC Quad9 Yandex Public DNS resolvers are operated either by commercial companies, offering their service for free use to the public, or by private enthusiasts to help spread new technologies and support non-profit communities. 
