Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Wondershare PDFelement - All-in-one PDF editor
Geary - Geary is an email application built for GNOME 3.
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.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
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.