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.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
PlanMaker - PlanMaker, the fast, powerful and compatible spreadsheet program in SoftMaker Office for Windows, Mac and Linux
EtherCalc - EtherCalc is a web spreadsheet.
Gnumeric - Gnumeric