From: http://www.ldapadmin.org/

What is LDAP Admin?
Ldap Admin is a free Windows LDAP client and administration tool for LDAP directory management. This 
application lets you browse, search, modify, create and delete objects on LDAP server. It also supports 
more complex operations such as directory copy and move between remote servers and extends the common 
edit functions to support specific object types (such as groups and accounts).

You can use it to manage Posix groups and accounts, Samba accounts and it even includes support for 
Postfix MTA. Ldap Admin is free Open Source software distributed under the GNU General Public License. 

http://jxplorer.org/

JXplorer is an open source ldap browser originally developed by Computer Associates' eTrust Directory development lab. It is a standards compliant general purpose ldap browser that can be used to read and search any ldap directory, or any X500 directory with an ldap interface. It is available for immediate free download under a standard OSI-style open source licence.

See: https://confluence.atlassian.com/display/DEV/Identifying+Active+Directory+connection+details for details of configuration parameters for Active Directory

jxplorer

ldp.exe

Adsiedit.msc

http://serverfault.com/questions/294191/is-my-ad-already-an-ldap-server

Having said all that, I prefer ADExplorer from Sysinternals to a plain-jane LDAP browser. It's a little easier to use, since it's meant for use with AD specifically.

es, Domain Controllers speak LDAP.

  LDAP port 389
  LDAP+SSL port 636

As we run Google Apps Directory Sync directly on a DC, I just use port 389. You do, of course, have the option to connect using LDAP+SSL.

  Windows Server 2003

  Building on the foundation established in Windows 2000 Server, the Active Directory service in Windows Server 2003 extends beyond the baseline of LDAP compliance into one of the most comprehensive directory servers offering a wide range of LDAP support. Accordingly, the Windows Server 2003 Active Directory service introduces a number of new LDAP capabilities targeted for IT professionals and application developers. Some of the latest LDAP features include:

  •Dynamic Entries - Active Directory can store dynamic entries allowing the directory to assign Time-To-Live (TTL) values to determine automatic entry deletion.

  •Transport Layer Security (TLS) - Connections to Active Directory over LDAP can now be protected using the TLS security protocol.

http://technet.microsoft.com/en-us/library/cc977992.aspx

http://www.openldap.org/

OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol. The suite includes:

• slapd - stand-alone LDAP daemon (server)
• libraries implementing the LDAP protocol, and
• utilities, tools, and sample clients.