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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.
You might also want to take a look at existing libraries how they generate PDF. For example the PDF backend library at https://github.com/speedata/boxesandglue (from me). Or create simple documents with PDFTeX for example, PDFTeX produces clean output.
NOTE:
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Hence, a higher number means a more popular project.