Mac, Windows, Linux

If you don't want to pay the high price of Microsoft's Office, there is an alternative.

LibreOffice is the power-packed free, libre and open source personal productivity suite for Windows, Macintosh and GNU/Linux, that gives you six feature-rich applications for all your document production and data processing needs: Writer, Calc, Impress, Draw, Math and Base. Support and documentation is free from the large, dedicated community of users, contributors and developers.

LibreOffice is an office application suite available for a number of different computer operating systems. It supports the ISO standard OpenDocument Format (ODF) for data interchange as its default file format, as well as Microsoft Office '97-2003 formats, among many others.

What is Open source?
Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in.