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InfluxDB
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There is one thing that have stuck with me, though: Pure Data. I use it in one of my mobile apps as the audio backend, and the patch it is using is released as open source. The great thing about audio on Linux is that is allows users to easily delve into the technicalities of things. One of the reasons I took CS and became a programmer was because of following the Ardour developer mailing list and taking inspiration from there.
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.