Libre Office

LibreOffice is the free power-packed Open Source personal productivity suite for Windows,
Macintosh and Linux, that gives you six feature-rich applications for all your document
production and data processing needs: Writer, Calc, Impress, Draw, Math and Base. Support
and documentation is free from our large, dedicated community of users,
contributors and developers. You, too, can also get involved

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More Details :-http://www.libreoffice.org/