For word processing, spreadsheets, databases, and presentation software, I'd suggest OpenOffice or LibreOffice. OpenOffice is a product of Apache. LibreOffice is an offshoot of OpenOffice, produced by the Document Foundation.
Both are open source, free (though you can donate if you'd like, you don't get anything extra for the donation), and around 99.7% compatible in every way to Microsoft Office suite. I personally feel LibreOffice has more functionality than MS.
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