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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.
Maybe getting in touch with bodies publishing in the field of math (American Mathematical Society, journals) offers a trail to font designers / companies (like Linotype). Note that the name of the fonts used in a pdf equally may be displayed by some viewers like the metadata (who authored the pdf when using what kind of pdfengine) - e.g. here for atril.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.