OpenOffice.org is an open source office suite that contains following application parts:

• Writer - for word processing
• Impress - for presentations
• Math - for authoring mathematical functions
• Draw - a vector drawing program
• Calc - a spreadsheet calculator
• Base - a desktop data base

OpenOffice.org is available for Windows and Linux, with NeoOffice being an OpenOffice.org-based alternative for Mac OS X.

OpenOffice.org Alternatives

• Microsoft Word
• Microsoft Powerpoint
• Micrsosoft Excel
  
• Microsoft Visio
  
• Apple Pages
• Apple Keynote
• Inkscape