Redmine.org is an open source project management application. It is simple to setup and works great. It supports LDAP authentication out of the box. We recently setup Redmine for a project to run behind IIS using fastcgi and wanted to automatically login using windows authentication. We didn’t see a option for this, so I created a simple plugin that can be used to add this functionality.

http://github.com/nanek/redmine_windowsauth