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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.
Ardour is a much better audio editor than Audacity in every possible way. Also, versions > 6 are super usable and easy to set up.
Zrythm looks promising, though I'm not an audio guy, myself.
NOTE:
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Hence, a higher number means a more popular project.