Key features of XOOPS

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 60 themes available for download!!

Overall XOOPS dispose of all the necessary features to make it the choice of many portals, providing a minimalist initial install, an excellent community support, provides lots of addon modules, themes and functionalities, in addition to its very good permissions system.

For more information and download http://www.xoops.org