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EtherCalc - EtherCalc is a web spreadsheet.
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.
Gnumeric - Gnumeric
Apache OpenOffice Calc - Calc, part of the https://alternativeto.
SSuite Axcel Professional Spreadsheet - This powerful and professional spreadsheet has all the tools you need to calculate, analyse, summarize, and present your data in numerical reports or colourful graphics.