These are published on Artifact Hub. To search:
helm search hub [KEYWORD] --list-repo-url --max-col-width [uint] -o [table|json|yaml]
For example:
helm search hub pi-hole --max-col-width 70 --list-repo-url
To add this repo and install one of its charts:
helm repo add santisbon https://santisbon.github.io/charts/
helm install $RELEASE $CHART --version $VERSION -n $NAMESPACE
# or directly from https://santisbon.github.io/charts/<.tgz file>
More details: