The number of programs appearing in Linux versions is increasing all the time. You may find that your favorite program is already available in a Linux version; or if not, something very similar is. A prime examples are the Mozilla suite of Internet programs – Firefox for web browsing, Thunderbird for email, and the Sunbird calendar application. Not only do these run identically on both platforms, but nearly all the add-on extensions for these free programs work the same way. Google Picasa is also available for both platforms.
There are also increasing numbers of Linux programs which look and function in very similar ways to their Windows equivalents. Call it ‘cloning’, call it ‘reverse engineering’, but however you describe it, the fact is that an ordinary Excel user could happily work for a week in a Linux application like OpenOffice Calc without even noticing the difference and PowerPoint users will find the same to be true of OpenOffice Impress.