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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.
Scan to pdf script with ocr, for an idea of what it can be capable of https://github.com/rocketraman/sane-scan-pdf
NOTE:
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Hence, a higher number means a more popular project.