OpenOffice Portable

It's no secret that Microsoft Office is the most popular office suite out there, both for professional as well as personal use. Still, there are some free alternatives that, most of the time, can easily replace Microsoft's famous software.

OpenOffice Portable is the portable version of OpenOffice, one of the best-known free open-source office suites available.

It includes a word processor, a spreadsheet tool, a document viewer, and a presentation editor. All of these tools contain the common functions you would expect, and are completely compatible with Microsoft Word, Excel, and Powerpoint.

If that weren't enough, OpenOffice Portable can be installed on any USB memory or portable hard drive, so you can take it with you to open and use on any computer.