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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.
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Krastorio2
An overhaul mod for Factorio focusing on end-game technologies and moderately increased complexity.
Or Mindustry, which is open source: https://mindustrygame.github.io/
Mindustry has two "planets" and they play entirely differently. The newer one, Erekir, is a mix of Factorio, tower defense and RTS elements.
I actually liked it a bit more than Factorio, because it is less complex.
I didn’t really like the first planet though (Serpulo) and stopped after playing through Erekir twice.
> The source is not publicly available, no. It‘s still being actively developed and sold after all.
Those two are definitely not incompatible. Take Karia[0] for example, which is fully Free Software[1].
[0] https://store.steampowered.com/app/1261430/Kandria/
[1] https://github.com/Shirakumo/kandria/blob/master/LICENSE