I have mentioned LibreOffice before, but it deserves another shout out. You can save your work in the native Open Document Format, OR you can save your work in Microsoft Office format to share with your Windows/Microsoft Office using friends. Word, Excel, Access, PowerPoint all have equivalent programs in LibreOffice such as Wrtier, Calc, Draw, Impress, and Base. It is free to use though donations are accepted. You can download the newest version as soon as it is available. Just use the link I provided. Or us the link to take you to the description of LibreOffice so that you can see what LibreOffice can do for you.