PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
Wondershare PDFelement - All-in-one PDF editor
ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
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.
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
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.