Recently I was evaluating various free LDAPv3 servers to store the profiles of TransactionCenter users. Apache DS was among the candidates. I did give their server a try and it seemed to fit my product’s purposes. But the greatest and most useful discovery on the Apache’s directory project website was their LDAP browser. I don’t know whether this is just a side-project or not, but I’ve been using it for 3+ months now and I can now say that this is the best LDAP client tool I have come across. And I have used a number of such software, free as well as commercial. Huge thanks to its creators!
Give it a try: Apache Directory Studio.
The client packs a lot of functionality so the GUI may appear a bit cluttered at first. But once I got used to it I trashed all other LDAP clients I had on my computer.