I find cross-platform and (mostly) open-source software meets nearly all of my needs these days.  On a new computer I install at least:

• LibreOffice
• Firefox
  • AdBlock Plus
  • Clean Links
  • XMarks
• Thunderbird
  • Lightning (calendaring)
  • Provider for Google Calendar (google cloud calendars)
  • Google Tasks sync (google cloud task list)
  • Lookout (read MS email attachments)
  • Enigmail (encryption/signatures)
• Skype
• Software Development
  • Gcc ARM Cross Compiler (ubuntu ppa is here)
  • Java SDK + Netbeans
    • Better Swing Application Framework
    • Fluidon (Java FX SceneBuilder integration)
    • Gson
    • Matisse (Swing GUI builder)
    • Plugins: CVS, C++, GdbServer
    • Primefaces
  • Em::Blocks (windows only)
  • ProjectLibre (like MS Project)
• Hardware Development
  • Eagle and/or Kicad
  • GerbV (linux) or Graphicode Prevue (windows)
  • LT Spice (windows/wine)
• Adobe Reader
• Gimp (bitmap graphics)
• InkScape (vector graphics)
• eDrawings Viewer (solid modeling viewer – Windows/Mac only 🙁  )
• TeamViewer (remote control / family tech support)

For cross-platform embedded development I use gcc + NetBeans.  On Windows I really like Em::Blocks.