LibreOffice is a free and open-source office suite that is compatible with other major office suites, and is available on all operating systems. It is an independently-developed version of the OpenOffice.org suite.
Microsoft Office is an office suite of applications, servers and services.
Apache OpenOffice is a leading open-source office suite that offers free applications for word processing, spreadsheet, presentations, graphics, databases and more.
iWork is an office suite by Apple. It includes Pages, a word processing and desktop publishing application, Keynote, a presentation package, and Numbers, a spreadsheet application.
OfficeSuite is a cross-platform office suite for Windows PC, Android, and iOS.