OpenOffice.org product is a multi-platform office productivity suite. It includes the key desktop applications, such as a word processor, spreadsheet, presentation manager, and drawing program, with a user interface and feature set similar to other office suites.
New Features in version 3.0 includes Personal Information Manager (PIM) PDF import into Draw (to maintain correct layout of the original PDF), Web 2.0 support for weblogs and wikis, Office 2007 OOXML document import filter, Support for Mac OS X Aqua platform, Redesigned, more modern GUI., Extensions, to add third party functionality etc.
If you’re sick of Microsoft Office and don’t want to pay a hectic upfront cost just to write simple documentation/presentation/spreadsheet, then OpenOffice might be a suitable office replacement suite for you. It’s free and can be downloaded here. The most wanted features for most users of saving/exporting documents in pdf is even supported by default without installing any extra plugins plus it supports all of the popular document extensions that Microsoft Office creates including the infamous Microsoft Office 2007 (also called Office Open XML) file formats .docx, .pptx, and .xlsx.