OpenOffice: a freely available application suitable for office work.

OpenOffice (originally StarDivision's StarOffice but acquired and modified by Sun Microsystems) is completely free, offers 100% binary compatibility with MS-Office data files, and works on far more machines than MS-Office does. It currently runs on Windows '95 / '98, Windows NT / 2K, Windows XP, Windows Vista, Solaris, Mac OS X, Linux, JavaOS, OS/2, etc.