I haven't tried every single one, but the AWS public ECR has a bunch of the "library" images from Docker Hub (e.g. public.ecr.aws/docker/library/golang:1.21 ) and as the "public" part implies, no creds required to access it
They do have a search interface, if one wanted to look for their favorite: https://gallery.ecr.aws/
We switched many images to use the ecr.aws registry because we were getting rate-limited on dockerhub. Our k8s cluster was on EKS and it worked out very well.
you probably need mirroring anyway. Lots of stuff missing on public ecr. I haven't verified if those on public ecr are legit or not or at least, same as the dockerhub counterpart.
They do have a search interface, if one wanted to look for their favorite: https://gallery.ecr.aws/