OpenOffice by Sun Microsystems

OpenOffice icon OpenOffice (AKA OpenOffice.org) is a free cross-platform Office Suite.

It is developed and released to the opensource community since 2000 with the intention of taking marketshare away from Microsoft Office.

OpenOffice is comprised of 6 applications.

Writer
Writer is OpenOffice's Word processor, and has the ability to export PDF files.
Calc
Also with the ability to export to PDF, Calc is a spreadsheet and graphing application much like Microsoft Excel.
Impress
This is the slideshow or presentation program. The PowerPoint equivalent.
Base
Base is a database program for JET, ODBC and many types of SQL.
Draw
Vector graphics program.
Math
Mathematical formulae program.

OpenOffice is a very comprehensive and complete office suite, so be prepared for the large download. I'm looking at about 142MB for the Windows version.

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