Apps similar to Wren:DS include Microsoft Active Directory. It's paid, but OpenLDAP and ApacheDS are free. Other options are OpenDJ. In total there are four apps like Wren:DS for Windows, Linux, Mac and self-hosting.
Active Directory (AD) is a directory service that Microsoft developed for Windows domain networks and included in most Windows Server operating systems as a set of processes and services.
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OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
ApacheDS™ is an extensible and embeddable directory server entirely written in Java, which has been certified LDAPv3 compatible by the Open Group. Besides LDAP it supports Kerberos 5 and the Change Password Protocol.
OpenDJ is a directory server which implements a wide range of Lightweight Directory Access Protocol and related standards, including full compliance with LDAPv3 but also support for Directory Service Markup Language (DSMLv2).
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