LibreOffice is a free and open-source office suite that is compatible with other major office suites, and is available on all operating systems. It is an independently-developed version of the OpenOffice.org suite.
The office suite includes:
LibreOffice - Writer, a word processor with similar functionality and file support to 
Microsoft Office Word . It has extensive WYSIWYG word processing capabilities, but can also be used as a basic text editor. More Info »
LibreOffice - Calc , a spreadsheet program, similar to 
Microsoft Office Excel . It has a number of unique features, including a system which automatically defines series of graphs, based on information available to the user.
LibreOffice - Impress , a presentation program resembling 
Microsoft Office Powerpoint . Presentations can be exported as SWF files, allowing them to be viewed on any computer with Adobe Flash installed.
LibreOffice - Draw , a vector graphics editor and diagramming tool similar to 
Microsoft Office Visio . It provides connectors between shapes, which are available in a range of line styles and facilitate building drawings such as flowcharts. It also includes features similar to desktop publishing software such as 
Scribus and 
Microsoft Office Publisher .
LibreOffice - Math , an application designed for creating and editing mathematical formulae.
LibreOffice - Base , a database management program, similar to 
Microsoft Office Access .
