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nginx
The reverse proxy that routes traffic and handles HTTPS for every service in this stack.
With a dozen-plus self-hosted services running, nginx is what makes them reachable through clean, memorable web addresses instead of a pile of ports and IP addresses to remember. It also handles the HTTPS certificates so every connection is encrypted.
It's invisible when it's working (which is most of the time), quietly routing each request to the right service behind the scenes.