Wondershare PDFelement - All-in-one PDF editor
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
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.
Sound Control - App-specific volume control
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.
Power mixer - Power Mixer is a complete Windows volume control replacement.