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OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
Jumpseller - Start Your Online Store! Grow your business.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.