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Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
NEWOLDSTAMP - Email signature generator
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
Exclaimer - Exclaimer is the industry's leading provider of email signature solutions, empowering businesses to unlock the potential of email as a key digital advertising channel.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.