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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.
Their source code is here, so you could self host (or host on a rented cloud server) or look for other tag-based image management systems like this. I know there are other very similar sites.
NOTE:
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Hence, a higher number means a more popular project.