Document .Net - Gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.
ApowerPDF - ApowerPDF is a versatile PDF editor which also features as PDF converter, viewer, creator and more. It provides a perfect solution for all users.
PdfPig - Read and extract text and other content from PDFs in C# (port of PDFBox)
Easy PDF - EasyPDF is a free online PDF conversion suite that can help you convert & create PDFs. Securely, anonymously and without any limitations.
PDFSharp - Office & Productivity and Development
FoxyUtils Online PDF Tools - All the PDF tools you need! Save time with our easy to use online tools to merge, split, convert, and edit PDF files.