Every computer needs applications to do any work, and that means more money. Except for open-source software, like OpenOffice, which is free. In the case of OpenOffice, the free software looks and acts like Microsoft Office circa 2003, and includes a word processor, spreadsheet and presentation creator. Not only does OpenOffice look and feel like Office, but it also reads and writes Office files so well that most users could exchange files between the two suites and no one would know the difference.

Apache OpenOffice 4.1.2: Full Review of The Open-Source Office Alternative | Laptop Mag