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
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)
PDF Reader Pro - PDF Reader Pro is an all-in-one PDF office supporting to Read, Annotate, Edit, OCR, Convert, Create & Fill Form, Sign PDFs, TTS on Mac, iOS, Android, and Windows.
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.