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.
Zeplin - Collaboration app for UI designers & frontend developers
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.
Pamela for Skype - A versatile and easy to use Skype audio and video recording software. Features
Wondershare PDFelement - All-in-one PDF editor
ActiveWords - Auto correct on steroids