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.

Freefileviewer - Free viewer for PDF, DOC, DOCX, PHP, CFG, DAT etc. files

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.

PDF Reader Pro - PDF Reader Pro is an all-in-one PDF office supporting to Read, Annotate, Edit, OCR, Convert, Create & Fill Form, Sign PDFs, TTS on Mac, iOS, Android, and Windows.

Wondershare PDFelement - All-in-one PDF editor

SysTools OST Viewer - Free Outlook OST Viewer Software is used to open OST file with attachments. OST Reader Tool provide a complete solution to view corrupted, orphaned OST files.