Vendure is a mature, open-source headless commerce platform built on NestJS, GraphQL, and TypeORM. It provides a complete backend for e-commerce operations including product catalog management, order lifecycle, payment/shipping/tax processing, promotions, and multi-channel support. The monorepo contains a core backend package, two parallel admin UIs (an older Angular-based admin-ui and a newer React-based dashboard), a CLI tool for scaffolding and migrations, and a plugin ecosystem with official plugins for email, asset server, job queues (BullMQ), caching (Redis), telemetry (OpenTelemetry), and AI integration via the MCP (Model Context Protocol) plugin. The architecture is modular with a strategy pattern for extensibility, an event bus for domain events, a job queue system, and a custom fields system. The codebase demonstrates strong engineering practices with extensive test coverage, CI/CD pipelines, and active maintenance. Notable reusable components include a generic finite state machine framework, a runtime-resolved custom fields system, an OAuth 2.1 authorization server, a dynamic form engine, and a tag-based cache invalidation service.
Sylius is a mature open-source e-commerce framework built on Symfony, organized as a monorepo of decoupled PHP bundles and domain components. In production it powers multi-channel, multi-currency, multi-locale storefronts with product catalogs, carts and checkout, order management, payments via Payum, taxes, shipping, promotions and coupons, inventory, customer accounts, and an admin panel. It exposes a JSON:API via API Platform for headless commerce, a Twig/Stimulus storefront, an admin interface, and CLI commands for installation, user management, and maintenance. The domain logic lives primarily in the Sylius Component and Bundle layers, with UI and API layers acting as adapters over shared services.
Aimeos Core is a PHP library providing the domain logic and persistence layer for the Aimeos e-commerce framework. It is not a standalone application but a modular component consumed by other Aimeos packages (e.g., Laravel adapter, admin UI). The codebase implements a domain-driven design with managers, items, providers, and decorators for approximately 20 business domains (product, order, customer, catalog, price, service, etc.). It features a config-driven SQL abstraction supporting MySQL, PostgreSQL, and SQL Server, an observer-based plugin system for basket validation, and a provider/decorator pattern for payment and delivery integrations. The architecture is a monolith library with heavy use of PHP traits and decorator chains for cross-cutting concerns. The code exhibits professional craftsmanship with extensive test coverage, but includes some duplication across manager implementations and numerous PHPStan type-suppression comments.
BeikeShop is a production-ready, open-source cross-border e-commerce platform built on Laravel 12 (PHP 8.2+). It provides a full-featured online store with admin panel, shop frontend, multi-language (10+ languages), multi-currency, and a plugin system for extensibility. The codebase is a Laravel monolith with separate `Beike\Admin`, `Beike\Shop`, and `Beike\AdminAPI` namespaces, using Blade templates, Vue 2 (Element UI) for admin, and jQuery for the shop frontend. Key features include product/category management, shopping cart, checkout with multiple payment gateways (Stripe, PayPal, etc.), order state machine, RMA (returns), tax calculation, a drag-and-drop page builder for home pages, and a comprehensive installer. The architecture follows repository and service patterns, with a custom hook system for plugin extensibility. While the codebase is functional and actively maintained, it shows signs of technical drift (Vue 2, older JavaScript libraries, hardcoded strings, and some poor machine translations) and the plugin system adds complexity. The highlight is a well-designed, reusable Hook system and a clean StateMachineService for order workflows.
OpenCart is a free and open-source e-commerce platform written in PHP. It provides a complete online store solution with both a storefront (catalog) and an administrative backend. The architecture follows a custom MVC framework with a route-based dispatch system, event hooks, and an extension system for payments, shipping, modules, and themes. The frontend uses a mix of jQuery (admin) and a custom WebComponent framework (catalog) with a custom template language called Curlytag. The system supports multi-store, multi-language, and multi-currency out of the box, with background task processing for cache generation and email delivery. In production, OpenCart handles product catalog management, shopping cart and checkout flows, customer accounts, order processing, payment integration, shipping calculations, tax handling, and reporting. It includes CMS capabilities (articles, blogs, comments), GDPR compliance tools, and SEO-friendly URL rewriting. The admin panel provides full control over store settings, localization, user permissions, and extension management. Key entry points include the storefront index.php (catalog), admin/index.php (admin panel), and system/framework.php (application bootstrap). External dependencies include a database (MySQL/PostgreSQL), optional caching (Redis/Memcached), and third-party libraries for email, template rendering (Twig), and code editing (CodeMirror). The system is designed to be extensible through a plugin architecture that allows adding new payment gateways, shipping methods, and frontend modules.