Apache OpenOffice 4.0.1 for Mac [Open Source Download]
The product is a multi-platform office productivity suite including a word processor, a spreadsheet program, a presentation manager, and a drawing program, with a user interface and feature set similar to those of other office suites.
OpenOffice reads and writes in Microsoft Office and iWork productivity suite formats.
Available for Windows and Mac computers.
OpenOffice runs on Solaris, Linux (including PPC Linux), and Windows.
Written in C++ and with documented APIs licensed under the LGPL and SISSL open-source protocols, OpenOffice.org allows any knowledgeable developer to benefit from the source.