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Google Doc Publisher - Make Google Docs good-looking in two clicks
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
Content Editor 2.0 by Surfer - Content Editor is the most advanced content optimization tool that allows you to write and grade your work.
Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
SEO Minion - Chrome extension & Firefox add-on to help you with SEO
IronPDF - SDK for creating and editing PDFs.