PdfPig - Read and extract text and other content from PDFs in C# (port of PDFBox)
CutePDF - CutePDF is a simple but entirely powerful PDF files creator, converter, and virtual printer.
Document .Net - Gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.
FoxIt - FoxIt offers solutions to read and edit PDFs from PCs or mobiles.
PDFSharp - Office & Productivity and Development
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.