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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
MatrixSpigotBridge. It's basically DiscordSRV, but for https://matrix.org chat rooms. It's got less than a hundred downloads on the Spigot site. We use it to keep an eye on who's online and what's being said, and some of our players also use it to chat to people on the server when they're away from their computer. It's nice to be able to self host such a system, and it also helps reduce clutter on the Discord server. Players who don't have Discord can also take advantage of it.
RiceStats - A plugin for exporting playerdata to InfluxDB, which lets you build neat Grafana Dashboards with player info like this.