Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
Kdan PDF Reader - The All-in-One Document Expert Designed for the Increasingly-mobile Workplace.
IronPDF - SDK for creating and editing PDFs.
iText - iText is an intuitive and refined text editor with word processing completely rewritten in Cocoa...
PDF to X - PDF to X is used to convert PDF documents to Word (.doc)/WordPad (.rtf) documents, HTML web pages, JPG/PNG/BMP/TIF/GIF/PCX/TGA images and plain text files in batch mode. It works without Adobe Acrobat or Adobe Reader.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.