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source-engine
Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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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.
According to the original post on /r/halflife, they used leaked source code for the Source engine, and simply compiled it for ARM. More specifically, they're using this.
NOTE:
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