Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
PDFpen - PDFpen is a PDF editor to add text, images, and signatures to PDFs.
Wondershare PDFelement - All-in-one PDF editor
Adobe Reader - Adobe Acrobat Reader is a free tool for viewing documents that have been stored in Adobe's Portable Document Format (PDF).
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.