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OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
PrestaShop - Create your online store with PrestaShop's free shopping cart software. Build an ecommerce website for free and start selling online with hundreds of powerful features.