Redmine plugin written by Emilio González Montaña which add extra funcionality to roadmap. You can find more information about original plugin in https://redmine.ociotec.com/projects/advanced-roadmap (no need to repeat http://www.redmine.org/boards/3/topics/31235 ;-) ).
This is a fork to try to get it working with Redmine 2.3.x while a better approach is provided by Redmine itself.