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Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
Document .Net - Gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
PdfPig - Read and extract text and other content from PDFs in C# (port of PDFBox)
IronPDF - SDK for creating and editing PDFs.
PDFSharp - Office & Productivity and Development