If you are looking for a CDN than there are tons of options like Fastly, StackPath, AWS Cloudfront, and many more. But if you mean like a type of security proxy with some features similar to Cloudflare, maybe BitMitigate https://bitmitigate.com
Horrible difficult name, and you might be associated with “far-right extremists” like 8chan if you use it but seems decent, now owned by Epik