iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
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.
PDFSharp - Office & Productivity and Development
Wondershare PDFelement - All-in-one PDF editor
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
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.