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https://hub.docker.com/_/registry is an easy option, but there are plenty more, like https://github.com/goharbor/harbor, https://www.projectquay.io/, https://jfrog.com/container-registry/
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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nerdctl
contaiNERD CTL - Docker-compatible CLI for containerd, with support for Compose, Rootless, eStargz, OCIcrypt, IPFS, ... (by AkihiroSuda)
I haven't tried it personally but you might be able to export the tar from docker host with docker cli and then load it on containerd host using nerdctl - https://github.com/containerd/nerdctl
NOTE:
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Hence, a higher number means a more popular project.