ActiveDirectory uses Net::LDAP to provide a means of accessing and modifying an Active Directory data store.

== DESCRIPTION: RubySync is a tool for synchronizing part or all of your directory, database or application data with anything else. It's event driven so it will happily sit there monitoring changes and passing them on. Alternatively, you can run it in one-shot mode and simply sync A with B. Yo...

PassiveLDAP is an LDAP-ActiveRecord interoperability library designed to allow an ActiveRecord model (usually the Users model) to be replaced with an LDAP-based model. Active Directory examples included!

Ruby/ActiveLDAP is a object-oriented API to LDAP

An extension of Authlogic to add LDAP authentication.