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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.
No, they're usually not published. I encourage you to do it yourself.
Looks like Instagram at least does do TLS cert pinning, but it looks like there are patched binaries that disable it.
https://github.com/Eltion/Instagram-SSL-Pinning-Bypass
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.