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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.
That's a bit of a rose tinted view how open source works. In reality there's two developers on this project as you can see here: https://github.com/photoprism/photoprism/graphs/contributors
maybe this https://github.com/jellyfin/jellyfin/blob/da9042504a2f24608168d2f8addc75ab1d472e3d/README.md
NOTE:
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Hence, a higher number means a more popular project.