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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.
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Google Fonts
Font files available from Google Fonts, and a public issue tracker for all things Google Fonts
I think you might be taking the wrong approach here. You're right, some devices (anything that isn't Mac or Windows) don't have the "base 14" fonts available, but they don't need to if you just use embedded fonts in the generated PDFs. Any OFL-licensed font can be freely distributed with your app, and can be embedded in the PDFs generated by your app. Like all licenses you should read it yourself and not take my word for it, of course.
Nearly all of the ~1,500 font families in the Google Fonts library are OFL-licensed. That's a lot of options. You could also license a commercial font for a project like this, but this type of usage is called "server" licensing, and it's usually very expensive because users that haven't purchased their own license for the font will be able to generate documents in that font.