Excel xlsx, xlsm, xlsb, xls, xltx, xltm, xlt, xlam, xla, xlw, xml, csv, txt, prn, dif, slk, ods, xps, dbf
https://www.onlyoffice.com XLSX, XLS, ODS, CSV, TXT
https://www.libreoffice.org ods, ots, fods, xlsx, xlsm, xls, xlt, xml, csv, dif, dbf, slk
But I'm much to impressed by Modern CSV
https://www.moderncsv.com CSV, JSON, XML
I like CSV for not trying to be an incompetent version of SQL
https://www.onlyoffice.com XLSX, XLS, ODS, CSV, TXT
https://www.libreoffice.org ods, ots, fods, xlsx, xlsm, xls, xlt, xml, csv, dif, dbf, slk
But I'm much to impressed by Modern CSV
https://www.moderncsv.com CSV, JSON, XML
I like CSV for not trying to be an incompetent version of SQL