Wondershare PDFelement - All-in-one PDF editor
DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
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.
Mizage Divvy - Divvy is an entirely new way of managing your workspace.
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.
WindowGrid - Quickly and easily layout windows on a dynamic grid using just the mouse.