Which suite do you use? It sounds like the most popular ones right now are: LibreOffice, Calligra Suite, Gnome Office, and SoftMaker Office.
I've heard good things about AbiWord (which comes as part of the Gnome Office suite, apparently) but what I really need for school is a spreadsheet app that is fully compatible with Excel, especially all of its advanced "Data Analysis" functions for statistics, etc.
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