Haproxy, Cisco Umbrella, Fly.io, Datapath.io, DDoS-Guard, Koyeb, AWS Route 53, Amazon CloudFront, Imunify360, PageCDN, YAKUCAP, Alviy, Google Cloud DNS, Sqreen, CloudLayar, Sucuri, Constellix, MyraCloud, Abbey from Mister Scanner, Akamai, CDNify, BitMitigate, Jet-Stream, CDNlion.com, Cachoid, Neustar SiteProtect, HE.NET Network Tools, Nexusguard, open-appsec, Haltdos are some alternatives to Cloudflare.