WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
Sendlane - Marketing automation and campaign management solution
OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
VipeCloud - Forecast Automation. Sales, Pipeline, and Campaigns all in one product - a CRM replacement.
Jumpseller - Start Your Online Store! Grow your business.
CS-Cart Multi-Vendor - On-premises eCommerce marketplace builder