LDAPManager is an open source Cocoa application, written in Objective-C, to provide an LDAP browser/editor with a native Mac OS X interface. Should work fine on Tiger and Panther, and perhaps earlier.
Total garbage. Can't search (Find is ghosted out). If you try to connect to a different favorite, it goes into infinite wait.
Fails to read from keychain, can't add objects, often succumbs to the beachball of death when trying to connect to a non-existant server, say because the servername was mistyped or the server doesn't listen on the specified port.