Wren:DS is described as 'LDAPv3 compliant directory service providing a high performance, highly available, and secure store for the identities managed by your organization' and is an app. There are four alternatives to Wren:DS for Windows, Linux, Mac, BSD and Self-Hosted. The best Wren:DS alternative is Microsoft Active Directory. It's not free, so if you're looking for a free alternative, you could try OpenLDAP or ApacheDS.
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.
Microsoft Active Directory is the most popular Windows alternative to Wren:DS.
Microsoft Active Directory is the most popular commercial alternative to Wren:DS.
OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
OpenLDAP is the most popular Mac & Linux alternative to Wren:DS.
OpenLDAP is the most popular Open Source & free alternative to Wren:DS.
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).
OpenDJ is the most popular Self-Hosted alternative to Wren:DS.
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