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I've been playing a bit of Open Transport Tycoon recently, the trains are by far my favourite aspect and probably the most detailed in the game too. Getting all the track layouts and signalling to be efficient is a challenge under ever increasing demand. https://www.openttd.org/
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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Not it is the free software or open source version of this game, but OpenLoco https://openloco.io/ is great, and I hope that this game in near future will have a free assets like as OpenTTD https://www.openttd.org/ .
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.