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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.
I also recently completed the r/roguelikedev follow along in it: https://github.com/davesmith00000/roguelike-tutorial
The engine's site is here: https://indigoengine.io/
It's a code-only engine for Scala Functional Programmers, and so doesn't follow the usual ECS-like paradigm, and is more like Elm (or React+Redux). Employing an immutable side-effect free unidirectional data flow approach with strict model and view separation, means it's easier to understand whats going on in your game, removes race conditions, and makes it much easier to write bug-free games. Being purely functional (if you choose to...) also means unit or property-based testing of games is a relatively painless experience (e.g. no mocking needed).