Wren - Offset your carbon footprint by saving rainforests
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
YAYZY - Track the carbon footprint of each purchase in real-time
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
Klima - Go carbon neutral
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.