CoreMedia Content Cloud has an integrated user management, but also supports an LDAP server for user management.

Lightweight Directory Access Protocol (LDAP) is a set of protocols for accessing information directories. It is based on the standards within the X.500 standard, but is significantly simpler. Unlike X.500, LDAP supports TCP/IP, which is necessary for any type of Internet access. Because it's a simpler version of X.500, LDAP is sometimes called X.500-lite.