LibreOffice 4.0.2 (Windows)

LibreOffice is a free and open source office suite, developed by The Document Foundation. It is descended from OpenOffice.org, from which it was forked in 2010. It is a free equivalent to Microsoft Office.

The LibreOffice suite includes a word processor, spreadsheet, graphics editor, slideshow creator, database and math formula writer.

It is designed to be compatible with other major office suites, including Microsoft Office, though some Microsoft Office layout features and formatting attributes are handled differently or are unsupported. LibreOffice is available for a variety of computing platforms, including Microsoft Windows, Mac OS X 10.4 Tiger or newer, and Linux-based systems running Linux kernel version 2.6.18 or newer. It is the default office suite of popular Linux distributions like Debian, Fedora, openSUSE and Ubuntu. Ports for FreeBSD, NetBSD, and OpenBSD are being maintained by contributors to those projects, respectively.

Between January 2011 (its first stable launch) and October 2011, LibreOffice was downloaded approximately 7.5 million times.

(source: Wikipedia)