Portainer is an Australian open-source container management platform deployable from a single container, unifying Docker, Docker Swarm and Kubernetes management. The CE edition is free forever, making it one of the most popular web UIs for self-hosted container environments.
Cockpit is the Red Hat-led open-source Linux server web management console, letting you handle system monitoring, Podman container management, LVM storage management, and user configuration from a browser, free and open source, ideal for Linux server administrators and cloud server ops.