OpenOffice:

Applications like OpenOffice enable those who can't afford Microsoft Office to function in a business (business-like or educational) environment. OpenOffice is one of the pillars of the open source communities and is one of the most important cross-platform applications available.

Firefox:

And here is one of the most popular cross-platform applications ever, the only web browser which clearly took over the reign from Internet Explorer in the browser world- Mozilla Firefox. Firefox has paved the way to the fact that a good cross-platform browser is so essential for day-to-day life. Thankfully, the rise in popularity of cross-platform browsers like Firefox has helped ensure that companies don't lock down their sites and services to a single browser.

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