OpenCart
OpenCart is a free, open-source e-commerce platform written in PHP that allows businesses to set up and manage online stores. It provides a modular architecture with features like product management, payment gateways, shipping methods, and multi-store support out of the box. The platform is known for its user-friendly admin interface and extensive marketplace of extensions and themes.
Developers should learn OpenCart when building or customizing e-commerce websites for small to medium-sized businesses, as it offers a lightweight and flexible solution compared to heavier platforms like Magento. It's particularly useful for projects requiring rapid deployment, cost-effective customization, or integration with specific payment or shipping providers through its extension ecosystem.