Wondershare PDFelement - All-in-one PDF editor
Google Calendar - Spend less time managing your day & more time enjoying it
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.
Jorte - Schedule books must be practical and has a good design.
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.
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.