Contenido is a CMS (content management system) for the Web environment. It features advanced user management, in-site editing, a WYSIWYG editor, and more.
OWX (OmniaWeb-X) is Web-based site mangement software and a development framework that uses exclusively open source software to run.
Standards-compliant Java persistence via JDO/JPA/REST and RDBMS/MongoDB/Neo4j/Excel/LDAP.
A CalDAV Web client.