The source code for Bitnami containers and Helm charts remains publicly available on GitHub and continues to be licensed under Apache 2.

What’s changing is that Bitnami will no longer publish the full catalog of container images to DockerHub. If you need any image, you can still build/package it yourself from the open-source GitHub repositories.

https://artifacthub.io/

I don't know why but Artifact Hub never shows up in Google search when you search for "web site with helm charts". Hopefully this gives it a boost.

Check out Artifact Hub, the CNCF-hosted charts from projects like Prometheus/Grafana, or the official k8s-at-home charts as solid alternatives to Bitnami.

My first thought was Linuxcontainers but I think they just maintain docker images, not helm charts

They're all open source - fork the repo and start collectively maintain them.