Joomla!

Open-source content management system for building websites and online applications. Provides a flexible platform for publishing and organising content with built-in SEO tools, multilingual support, and an extensible architecture that scales from simple blogs to complex multi-tenant applications.

Joomla powers a significant share of the web, including business sites, government portals, and non-profits. It stands apart as the only major CMS built entirely by volunteers, backed by a large global community and thousands of free extensions and templates. The project maintains a security-conscious development process with a dedicated strike team, and the same codebase doubles as a lightweight PHP framework for building custom web and CLI applications.

Key features:

• SEO-ready URLs, meta descriptions, and sitemaps out of the box
• Multilingual content management with over 70 translation packs
• Granular access control (ACL) and two-factor authentication
• Template overrides and Bootstrap-based responsive design
• Large extension marketplace for extending core functionality

Use cases: business and corporate websites, intranets, blogs, community sites, multilingual portals, and government or non-profit projects. Developers can leverage the MVC architecture and documented API to build custom components or use the standalone framework for non-CMS PHP applications.