XOOPS is one of world's leading Open Source CMS (Content Management System), written in PHP for the MySQL database. Its object orientation makes it an ideal tool for developing small or large community websites, corporate portals, weblogs and much more.

XOOPS is an acronym of eXtensible Object Oriented Portal System.

Though it began as a portal system, XOOPS is primarily used as a Content Management System and is transitioning towards a Web Application Platform. It can also function as a web framework suitable for small, medium, and large websites.

• Database-driven XOOPS uses a relational database (currently MySQL) to store data required for running a web-based content management system.
• Fully Modularized Modules can be installed/uninstalled/ativated/deactivated with a click using the XOOPS module administration system.
• Personalization Registered users can edit their profiles, select site themes, upload custom avatars, and much more!
• User Management The ability to search for users by various criteria, send email and private messages to users through a template-based messaging system.
• Supported World-wide XOOPS was created and is maintained by a team of several hard-working volunteers working from all over the world. The XOOPS community has more than dozen official support sites around the world for support of non-English speaking users.
• Multi-byte Language Support Fully supports multi-byte languages, including Japanese, Simplified and Traditional Chinese, Korean, etc.
• Versatile Group Permissions System Powerful and user-friendly permissions system which enables administrators to set permissions by group.
• Theme-based skinnable interface XOOPS is driven by a powerful theme system. Both admins and users can change the look of the entire web site with just a click of a mouse. There are also over 1000 themes available for download!