OpenOffice
OpenOffice is one of the best reviewed and oldest in the family of productivity software suites. It takes care of all the typical office needs: word processing, spreadsheets, presentations, graphics, databases and more. The software is available for all possible operating systems and in many languages. It can open & save your files to an international open standard format and to many additional formats common to other office software packages as well. The best thing about it - it can be downloaded and used for any purpose completely free!