What are some alternatives?
When comparing EtherCalc and LibreOffice - Calc, you can also consider the following products
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Gnumeric - Gnumeric
Apple Numbers - Numbers lets you build beautiful spreadsheets on a Mac, iPad, or iPhone — or on a PC using iWork for iCloud. And it’s compatible with Apple Pencil.
Apache OpenOffice Calc - Calc, part of the https://alternativeto.
Spread32 - Free Excel compatible spreadsheet