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Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
EtherCalc - EtherCalc is a web spreadsheet.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Gnumeric - Gnumeric
iBus - Intelligent Input Bus.