We use PDFlib, but we started using it a long time ago when there wasn't a lot of good open source options for building pdfs. PDFlib isn't open source or free.

We use PDFlib, but we started using it a long time ago when there wasn't a lot of good open source options for building pdfs. PDFlib isn't open source or free. So far PDFlib has worked well and not been so expensive that we've needed to look for anything else. https://www.pdflib.com/ https://www.pdflib.com/