OpenOffice ( http://www.openoffice.org/ ) is the leading 100% free open-source office software suite available on Linux, Macintosh, and Windows Operating systems available under the GNU Lesser General Public License (LGPL). The project and software are informally referred to as OpenOffice, but this term is a trademark held by another party, requiring the project to adopt OpenOffice.org as its formal name. It has word processing, spreadsheets, presentations, graphics, and databases. Additionally it supports the new International ISO standard OpenDocument Format (ODF) as its default file format, Microsoft Office 1997-2003 formats, as well as many others. It also has the ability to create PDF files in a standard read only format.
Back in August 1999 Sun Microsystems purchased a program called Star Office from StarDivision and OpenOffice was originally derived from that. The source code of the suite was released to compete with Microsoft Office by providing a free high-quality open source alternative. Sun now releases Star Office which is based upon builds from OpenOffice with additional components.
OpenOffice.org has a standard collection of applications that mirror what you see in suites like Microsoft Office and contain the features expected from an office suite. The components available include:
~~ Download and Install
Download and install is not really that hard. Go to OpenOffice.org and download that latest version and then install it. Be sure that if you have Microsoft Office installed that you do not replace the default file types. I have seen issues with that and you can always change it later.
-- Open Office Extensions - New functionality, tweaks, or new features to the Open Office user interface. (e.g. Report builders, extended language support, eFax ability, clip art gallery, etc.) - http://extensions.services.openoffice.org/
-- OpenOffice.org Portable - A complete OpenOffice.org office suite including a word processor, spreadsheet, presentation tool, drawing package, and database packaged as a portable app. This way you can take all your documents and everything you need to work with them wherever you go - http://portableapps.com/apps/office/openoffice_portable