From The Apache Software Foundation:
The Apache Software Foundation Announces 100 Million Downloads of Apache OpenOffice
The Apache Software Foundation (ASF), the all-volunteer developers, stewards, and incubators of more than 170 Open Source projects and initiatives, announced today that Apache OpenOffice has been downloaded 100 million times.
Apache OpenOffice is the leading Open Source office document productivity suite, available in 32 languages on Windows, OS X, and Linux. OpenOffice includes a word processor ("Writer"), a spreadsheet ("Calc"), a presentation editor ("Impress"), a vector graphics editor ("Draw"), a mathematical formula editor ("Math"), and a database management program ("Base"). As Open Source software, Apache OpenOffice is available to all users free of charge; the C++ source code is readily available for anyone who wishes to enhance the applications.
OpenOffice works with Microsoft Office files so it is a nice alternative to the $$$ that MSFT charges.
Download here: OpenOffice