Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
PdfPig - Read and extract text and other content from PDFs in C# (port of PDFBox)
PDF24 PDF Creator - Create PDF and convert documents to PDF for free with the free PDF24 PDF Creator.
Document .Net - Gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.
Merge PDF (by Smallpdf) - No file limit, no ad watermarks - a free and beautiful tool to combine your PDF files exactly the way you want it.
PDFSharp - Office & Productivity and Development