SparkFin - Learn the markets for free, profit forever.
Wondershare PDFelement - All-in-one PDF editor
Richie Invest - An app that lets you invest with your friends
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.
Rally Rd. - Invest in blue-chip classic cars like stocks
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.