RadaeePDF - RadaeePDF is a library for developers who want to render, manipulate, annotate PDF files on Android, iOS and Windows.
Document .Net - Gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.
CutePDF - CutePDF is a simple but entirely powerful PDF files creator, converter, and virtual printer.
PdfPig - Read and extract text and other content from PDFs in C# (port of PDFBox)
PDFJet - PDFJet is a mobile and cloud PDF Library for Java and .NET to generate PDF documents.
PDFSharp - Office & Productivity and Development