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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.
Maybe audiveris might work for you (I haven’t tried it myself though)? It looks like it can import pdfs or images of sheet music, you can transpose, and you can export as MusicXML file that editors like musescore and frescobaldi / lilypond can import.
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.