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.

The code repository is here: http://code.google.com/p/google-summer-of-code-2011-libreoffice/, but of course the best is to check the LibreOffice git repositories.