-
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.
LMMS - Windows, macOS, Linux Loop based music creation software. Be aware that it doesn't let you record audio so you'll be limited to using virtual instruments (of which there are a bunch included) and already recorded audio tracks and samples. If you do loop based music this would be worth checking out.
Ardour - Windows, macOS, Linux Fully fledged DAW. Akin to a traditional DAW like ProTools in terms of functionality (i.e. Audio recording, mixing, editing, MIDI sequencing).
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.