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
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.
Saint Paint Studio - Saint Paint - The Essential Image Editor
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
Sagelight - Sagelight is a comprehensive editing platform that allows adding multiple features to the images by improving, retouching, modifying the selective pics with high-quality work.