OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Jumpseller - Start Your Online Store! Grow your business.
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.