OpenOffice.org
OpenOffice.org was a free open source office suite. The free software project was hosted by Sun Microsystems and then Oracle Corporation and it was based on the older StarOffice software that was created by Sun Microsystems. It was available for many different operating systems, including Microsoft Windows, Linux, OS X, FreeBSD and Solaris; and was meant to be an alternative to Microsoft Office. It supported Microsoft Office file formats as well as its own OpenDocument format.