Adobe Acrobat Reader DC is the industry standard for viewing, printing, signing and commenting on PDF documents.

PDFedit is a free PDF editor for Unix-like operating systems (including Cygwin on top of Windows). It does not support editing protected or encrypted PDF file…

PDFill allows users to alter existing PDFs or create documents from scratch.

PDFescape is an advertising and fee supported, web-based PDF editor program written in JavaScript, HTML, CSS and ASP.