A Helm chart repository: helm repo add giantswarm-operations-platform-test-catalog https://giantswarm.github.io/giantswarm-operations-platform-test-catalog/
helm repo add giantswarm-operations-platform-test-catalog https://giantswarm.github.io/giantswarm-operations-platform-test-catalog/
The charts are listed in index.yaml. About this catalog: README.