No licensing fees - BOO is the localized version of Open Office. BOO is free for anyone to use and distribute at no cost. Many features that are available as extra cost add-ins in other office suites (like PDF export) are free with BOO. There are no hidden charges now or in the future.
Open source - You can distribute, copy, and modify the software as much as you wish, in accordance with either of BOO's Open Source licenses.
Cross-platform - BOO runs on several hardware architectures and under multiple operating systems, such as Microsoft Windows, Mac OS X, Linux, and Sun Solaris.
Consistent user interface- All the components have a similar "look and feel," making them easy to use and master.
Integration- The components of OpenOffice.org are well integrated with one another. All the components share a common spelling checker and other tools, which are used consistently across the suite. For example, the drawing tools available in Writer are also found in Calc, with similar but enhanced versions in Impress and Draw.
User does not need to know which application was used to create a particular file (for example, one can open a Draw file from Writer).
Granularity- Usually, if you change an option, it affects all components. However, BOO options can be set at a component level or even document level.