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OpenPDF
OpenPDF is a free Java library for creating and editing PDF files, with a LGPL and MPL open source license. OpenPDF is based on a fork of iText. We welcome contributions from other developers. Please feel free to submit pull-requests and bugreports to this GitHub repository.
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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.
IANAL, but if it's this (https://github.com/LibrePDF/OpenPDF) it seems to be LGPL, which means you can use it with a closed source, commercial app. There are additional restrictions however, so it'd be wise to do some more thorough reading around the license and what it allows (and doesn't.)