Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Wondershare PDFelement - All-in-one PDF editor
PDFZen - The powerful, simple, free online PDF editor for the masses; free yourself from the fax machine!
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.
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!
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.