Kdan PDF Reader - The All-in-One Document Expert Designed for the Increasingly-mobile Workplace.
PDF Clown - PDF Clown is an open-source general-purpose library for manipulating PDF documents through multiple abstraction layers, rigorously adhering to PDF 1.7 Specification
iText - iText is an intuitive and refined text editor with word processing completely rewritten in Cocoa...
PdfPig - Read and extract text and other content from PDFs in C# (port of PDFBox)
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.
Document .Net - Gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.