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Try Gnumeric or LibreOffice / OpenOffice. The latter is in some ways more flexible but the former is my favourite because it's fast and numerically superior. CSV is the best format for spreadsheets without formulas (it's plain text).
Not sure what the best is for more complicated stuff, but if you want to share with the most people possible, then MS Excel format is what is used most widely. That is what most people find easiest. Just make sure your file is clean and upload to the cloud.
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