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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.
You don't have to write it, someone already did, using essentially the same method Steam would use. I fail to see how depending on Steam is any different from depending on any other third-party application. You're taking Steam for granted, but it's not as if it's integrated into Windows.
NOTE:
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Hence, a higher number means a more popular project.