The suite of tools can run on various operating systems such as Windows, Linux, MacOS X (X11), and Solaris. It is compatible with all major office software suites. OpenOffice.org is free software that anyone can download, use, and promote for free. It includes six modules: Writer (text documents); Impress (presentations); Calc (spreadsheets); Draw (graphics); Math (formulas); and Base (database).
AbiWord - is a free, fast, and full-featured word processing program. Its interface is very similar to MS Word, and it can be used in Windows and many Unix operating platforms (with versions available for many different operating systems).