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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.
https://mixxx.org/ - free dj software, windows, mac, linux, supporting hardware midi dj controllers when you're ready to take it to the live performance level
https://ardour.org/ - this a professional digital audio workstation. the learning curve is steep, however you can do a lot with it. check for guides on youtube for additional inspiration
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.