Linux does have directory server called OpenLDAP, but it requires good understanding and admin skills. Enterprise networks now have an alternative choice to Microsoft Active Directory (AD) servers, with the open source Samba project aiming for feature parity with the forthcoming release of version 4.
Red Hat Directory Server (RHDS) wins “Best Identity Management Solution” at “SIIA’s 2008 Codie” awards. RHDS is based upon the Fedora Directory Server (FDS), which is an LDAP (Lightweight Directory Access Protocol) server developed by Red Hat, as part of Red Hat’s community-supported Fedora Project. Fedora Directory Server is identical to the Red Hat Directory Server (rebranded version).