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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.
About mPDF https://mpdf.github.io/ "mPDF is a PHP library which generates PDF files from UTF-8 encoded HTML."
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Hence, a higher number means a more popular project.