conceptcms is a scalable and flexible multi-customer, multi-language Open Source Content Management System, developped since 2002 by Interconcept GmbH and available under the GNU GPL license since 2008. Some of the most important features of conceptcms are:

• multi-customer enabled (based on multiple database or one database within one installation)
• multi-language support (character encoding is UTF8)
• separate working and live versions and a simple publishing mechanism
• media library, powerful image editing functionality
• WYSIWYG editor
• support for CSS framework YAML
• export and import complete Websites or "themes" or export and import parts of Websites
• rights management for customers and users, define rights based on groups, languages, functionality and content (menu items and media library directories)
• password-protected areas, show different content to different groups of users
• enhance functionality by simple PHP-based modules
• use different API for integration purposes

conceptcms is based on PHP and MySQL, so that installation is possible on typical LAMP and WAMP environments.