I searched alternatives to MS Office, and for the example of Excel I tried the 4 following Office apps:
- Libre Office Calc
- Planmaker FreeOffice
- WPS Spreadsheets
I was a little bit disappointed that for WPS Office was no German Interface and also no German regional settings.
Also I am a bit disappointed that the font size are not exact the same as they are on Windows in Excel.
Have a look on my screenshots.
This is only to make your own decisions.