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.

SageThumbs - SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats...

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.

MysticThumbs - MysticThumbs generates thumbnails of many image types not natively supported by Windows.

Wondershare PDFelement - All-in-one PDF editor

Icaros - Icaros is a collection of lightweight, high quality, Windows Shell Extensions