Ldap2Mailman is a little software I wrote to solve a particular problem. I was maintaining mailing lists for internal use. And all of the users where already defined in the company LDAP database. They even had the same groups definitions as we needed people in the mailing lists.

Strangely enough, mailman doesn't seem to be able to use LDAP as a base for the subscribers to it's lists. So i sat down and wrote a little script that does exactly that, it keeps the LDAP users in groups synchronized with lists of the same name.