NoPlayerStop

The mod watches player activity and begins its stop routine only after the last connected player leaves, so a brief disconnect and reconnect does not trigger it. A configurable grace period sets how long the server waits before it stops, and a live countdown prints warnings to the console beforehand. A toggle switches the whole system off, and the configuration file is generated on the first run, where the delays and other parameters can be adjusted.

The mod is built to add little overhead, and it is meant as a lightweight utility for servers that run only on demand. Because the server stops when nobody is playing, it frees CPU and RAM during downtime, which turns a server into something close to a serverless setup. The author describes it as a companion to mc-gate, an asynchronous proxy that detects a join attempt, runs a command to wake the server, and then lets NoPlayerStop handle the stop when the server empties again. Installed on either loader, the mod is server-side only, so players join without installing anything.