DirectoryScanner is the FREE Directory Server fingerprinting tool. It can help you to remotely detect the type of Directory servers (such as Microsoft Active Directory, Novell eDirectory, Open LDAP etc) running on the local network as well as Internet. It works on wide range of platforms starting from Windows XP to latest operating system Windows7. It comes with Installer which helps in local installation & un-installation of the tool. It can be used in penetration testing while evaluating client environments where multiple Directory servers are deployed.
Source: https://thehackernews.com/2011/04/directoryscanner-free-directory-server.html