FileProInfo - It's All About Files, Software, Online Tools - 100% Free
Wondershare PDFelement - All-in-one PDF editor
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
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.
GroupDocs - GroupDocs is a web-based service for online document sharing, collaboration and management.
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.