Unregistry is a lightweight OCI-compliant container registry that stores images directly in the local containerd content store. It is designed as a simpler alternative to a full Docker registry, primarily for pushing images to remote Docker daemons over SSH without an external registry. The project includes a Go server binary (cmd/unregistry/main.go) that implements the OCI distribution specification using the Docker Distribution library as a framework, with custom middleware that backs blob, manifest, and tag operations with containerd's content and image stores. A companion Bash script, docker-pussh, acts as a Docker CLI plugin to orchestrate pushing images: it establishes an SSH tunnel to a remote host, starts an ephemeral unregistry container, forwards ports, performs a standard docker push, then cleans up. The codebase is well-structured with clean abstractions, comprehensive error handling, and extensive test coverage including conformance tests against the OCI distribution spec and end-to-end tests using Docker-in-Docker containers. The storage layer in internal/storage/containerd demonstrates a solid pattern for integrating containerd with the distribution registry, handling leases, garbage collection labels, and resumable uploads. The project is actively maintained with recent commits and a responsive issue tracker.