Aspose.Cells for Cloud - Aspose.Cells for Cloud is a REST based API for processing spreadsheets in the cloud.
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Simple Spreadsheet - Simple Spreadsheet
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
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.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.