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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'd go with Quakeworld. The weapons are very strong, so it's easy to get frags even for beginners, even if you're playing against experienced players. On that same note, you'll also die a lot lol.
NOTE:
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Hence, a higher number means a more popular project.