What are some alternatives?
EtherCalc - EtherCalc is a web spreadsheet.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Apache OpenOffice Calc - Calc, part of the https://alternativeto.
TableEdit - free mac app to view and edit spreadsheets
Gnumeric - Gnumeric