I honestly can't think of one without googling. Cloudflare is kind of everywhere. Just like Google... can't really get rid of them even if you want to.
I'm sorry but that means your nerd card will expire at the end of the month. I see you've had it for quite a while, but being unable to name any CDN companies besides Cloudflare means your nerd card will lapse. If you'd like to apply for a newer issue one, an LLM agent will be along shortly to help you.
Now obviously my comment is not about "just a CDN provider" right?
The SSL stuff that Cloudflare offers to protect your websites/APIs etc so you don't have to, their DNS products. The fact that iCloud Private Relay uses Cloudflare under the hood (and so all browsing there happens through their gateways etc).
I mean, if it's just the case that you've drank that much of the Cloudflare Kool aid that Akamai, AWS, and GCP don't have competing options in your mind, then that's a different problem entirety. Good for Cloudflare's wallet, and kudos to their marketing team though.